Encapsulated benign tumors examples

What is a Benign Tumor? - Definition, Types & Examples

An example of a lipoma benign tumor. Meningiomas : These tumors develop in the membrane surrounding the brain or spinal cord, and most of them grow slowly. Myomas : These tumors grow from muscles. But benign tumors can be serious if they press on vital structures such as blood vessels or nerves. Therefore, sometimes they require treatment and other times they do not. Similarly one may ask, what does it mean when a tumor is encapsulated? Encapsulated: Confined to a specific area. For example, an encapsulated tumor remains in a compact form

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  1. 5.1. FIBROMA. Well circumscribed, encapsulated benign tumors, in which fibrocytes and collagen proliferate, are known under the generic designation of fibroma. The macroscopic aspect predisposes to confusions with fibrous scars or chronicized fibrosed inflammations
  2. Benign tumors of the eyelid include a variety of epidermal tumors, adnexal tumors (Chapter 19), and stromal tumors (Chapter 20). The benign epidermal tumors of the eyelid are similar to those observed in the other sun-exposed areas of the skin. Some benign eyelid lesions may represent manifestations of systemic disease (Chapter 22)
  3. Benign Malignant Tumor . BENIGN Although any lump formed by body cells may be referred to technically as a tumor. Not all tumors are malignant (cancerous). Most breast lumps - 80% of those biopsied - are benign (non-cancerous). Following are examples of the most common benign breast conditions which produce lumps
  4. The most common benign peripheral nerve tumor in adults, a schwannoma can occur anywhere. It typically comes from a single bundle (fascicle) within the main nerve and displaces the rest of the nerve. Some schwannomas enlarge and assume unusual shapes within your spine or pelvis, such as dumbbell tumors

Benign Tumor - an overview ScienceDirect Topic

  1. g cells (chondrocytes). Adenomas are benign tumors of gland-for
  2. Even in a tertiary referral center, we have found that most tumors of the foot and ankle are benign. Osteochondroma is the commonest benign bone lesion and xanthomatous and giant cell-rich tumors are the most frequently encountered benign soft tissue lesions 3
  3. Benign tumors have a smooth surface and are symmetrical. Under a microscope the cells of a benign tumor resemble cells of their origin and have a uniform appearance. Benign tumors are encapsulated (covered with a capsule-like material), which makes removal (excision) easier. Benign tumors rarely reoccur after removal
  4. examples of odontogenic tumors. adenomatoid odontogenic tumor ameloblastoma encapsulated. infiltrating tumors have a. high rate of recurrence resection jaw and reconstruction of tissue is needed. ameloblastoma (enamel organ) rare benign or cancerous tumor of odontogenic epithelium more common in lower jaw abnormal cell growth destroys bony.

Solitary and unicameral bone cysts are examples of benign latent tumors. A benign active tumor continues to enlarge and, although it is well encapsulated, may have an irregular or lumpy border. Most benign tumors of the hand fall into this category A noncancerous brain tumor is an unexpected cluster of abnormal cells in your brain.Most grow slowly. They can't spread to other parts of your body the way cancerous tumors do. But they can grow. Such benign tumors can occasionally produce symptoms related to bronchial obstruction (e.g., bronchial papillomas and mucous cell adenomas), or because of compression of lung parenchyma by sizable tumors (such as large solitary fibrous tumors of pleura/lung) Fibrous capsule: Benign tumors are generally encapsulated in a fibrous tissue capsule that acts as a protective sac and assists in its easy surgical removal. Benign Tumors Examples

A benign tumor can secrete hormones. For example, a benign tumor of the thyroid gland can cause thyrotoxicosis (excess of thyroid hormones) or a gastrinoma (stomach) can secrete gastrin leading to high gastric acid production. Sometimes a benign tumors can transform into malignant tumor (cancer) A primary brain tumor is an abnormal growth that starts in the brain and usually does not spread to other parts of the body. Primary brain tumors may be benign or malignant. A benign brain tumor grows slowly, has distinct boundaries, and rarely spreads. Although its cells are not malignant, benign tumors can be life threatening if located in a. Abstract. To determine if immunohistochemistry can be used as adjunct to the diagnosis and classification of oral benign neural tumors, we stained 77 neurally differentiated tumors with a panel of neural-associated antibodies (S-100 protein, CD57, epithelial membrane antigen, factor XIIIa, CD34, CD68, collagen IV)

Benign epithelioid peripheral nerve sheath tumors (BEPNSTs) have not been fully characterized, and their relationship to conventional schwannoma and neurofibroma has not been satisfactorily established. Herein, we detail the clinicopathologic features of 33 examples of BEPNST. The study included 22 In nervous system disease: Benign tumours Benign intracranial tumours do not spread within the brain or metastasize to distant sites. The most common benign brain tumours are neurofibromas (tumours of the myelin-forming Schwann cells), tumours of the skull, and meningiomas. Pituitary adenomas arise within the pituitary fossa

Different Kinds of Breast Lumps Stony Brook Cancer Cente

  1. Schwannoma. Schwannomas are the most common benign tumor of peripheral nerves, yet they account for fewer than 8% of all soft tissue tumors. 14 The incidence of benign schwannomas involving peripheral nerve tends to be higher in females than in males. These tumors can occur in patients with NF1; however, neurofibromas are much more common in this population. 1
  2. Benign tumors usually grow slowly, if at all, and they are generally not life-threatening. These are caused by a limited overgrowth of cells, usually without a known cause. Examples of benign neoplasm include: Skin moles 2 ď»
  3. Benign cystic teratomas: These tumors are also called dermoid cysts because although derived from all 3 germ cell layers, they consist mainly of ectodermal tissue. Fibromas: These slow-growing connective tissue tumors are usually < 7 cm in diameter. Cystadenomas: These tumors are most commonly serous or mucinous
Nursing Care of the Client with Cancer

Benign neoplasms of the lung represent a relatively uncommon group of tumors of epithelial and mesenchymal origin. These tumors are generally small (less than 3 cm) and, depending on their typical site of origin (endobronchial vs lung parenchymal), can be associated with symptoms of endobronchial involvement such as cough, postobstructive pneumonia, and hemoptysis or can be asymptomatic. Like the encapsulated variant, these tumors are considered in situ but lack myoepithelium and thus may be better classified as a good-prognosis subtype of invasive carcinoma. 2 Additionally, solid papillary carcinomas are negative for CK5/6 and are often positive for neuroendocrine markers, such as synaptophysin and chromogranin

Skin appendage tumors (an example being an eccrine spiradenoma amongst others)-PEN and skin appendage tumors are difficult, if not impossible, to differentiate clinically Histological features of PEN include a solitary well-circumscribed, partially encapsulated, intradermal nodule composed of interdigitating spindle cells grouped in distinct. Rarely, benign tumors have glandular elements, and in this case, they produce hormones or neuroendocrine factors that affect the body systems. The treatment of a benign tumor is a simple surgical excision. Examples of benign tumors can be given as fibroadenoma of breast, hepatocellular adenoma, squamous cell papilloma, myxoma, and schwannoma Giant-cell tumors are normally benign, with unpredictable behavior. It is a heterogeneous tumor composed of three different cell populations. The giant-cell tumour stromal cells (GCTSC) constitute the neoplastic cells, [3] which are from an osteoblastic origin and are classified based on expression of osteoblast cell markers such as alkaline.

Benign peripheral nerve tumor - Symptoms and causes - Mayo

Adenomas are benign tumors that develop in organs and glands. A polyp is a common one found in the colon. Less than 1 out of 10 become malignant. If necessary, they can be removed with surgery. Fibroids are the most common noncancerous tumors found in the uterus. Some have no symptoms, but fibroids can become painful if they grow into the. A Benign Tumor is a tumor that lacks all three of the malignant properties of a cancer. Thus, by definition, a benign tumor does not grow in an unlimited, aggressive manner, does not invade surrounding tissues, and does not metastasize. Common examples of benign tumors include moles and uterine fibroids. The term benign implies a mild and.

Benign tumor - Wikipedi

Benign peripheral nerve sheath tumors differ from other soft tissue tumors in several important respects. Most soft tissue tumors arise from mesodermally derived tissue and display a range of features consonant with that lineage. Nerve sheath tumors arise from tissues considered to be of neuroectodermal or neural crest origin and display a range of feature

Seborrheic Keratosis Common benign growth seen after third/fourth decade of life Ubiquitous among older individuals Tan to black, macular, papular, or verrucous lesion Occur everywhere except palms, soles, and mucous membranes Can simulate melanocytic neoplasms Pathogenesis: Sun exposure- Australian study found higher incidence in the head/nec Benign tumors are often encapsulated; malignant tumors usually are not. Regarding question 3: It's important to try to figure out the origin of an undifferentiated tumor (or any tumor, for that matter), because treatment is different for different tumors Benign Tumor Symptoms. Not all types of tumors, be it cancerous or benign, show symptoms. All depending on the location of the tumor, some symptoms may be affected by the functioning of the affected organ. For example, if you have a benign tumor in the brain, then you can experience headaches, vision problems, chaotic memory and so on

Chapter 17 - Benign Tumors of the Foot and Ankle

Among benign ovarian tumors, epithelial tumors account for 30% of the total up to age 40 years, 50% between ages 40 and 49, 70% between ages 50 and 70, and 90% thereafter. 9 As determined by ultrasonography, unilocular cysts without papillary vegetations on their walls may be assumed to be benign. 10 In 296 unilocular cysts seen on. This common type of benign nerve tumor tends to form in the center of the nerve. A neurofibroma might arise from several nerve bundles and tends to cause mild symptoms. This tumor most commonly develops in people who have neurofibromatosis 1 (NF1), a genetic disorder that causes tumors to grow on nerves Benign brain tumors are microscopically more differentiated, and encapsulated or isolated from surrounding normal tissue, with slower growth and less or no tendency to spread. Examples include meningiomas, pituitary adenomas and neurinomas (schwannomas). However, the location of a brain tumor may be more important than its growt Benign Serous Tumors . Benign serous tumors include cystadenomas, adenofibromas, cystadenofibromas, and surface papillomas. These tumors are common, accounting for approximately 25% of all benign ovarian neoplasms and 58% of all ovarian serous tumors. The peak incidence is in the 4th and 5th decades, and the median age is 41 years If lung cancer spreads to the liver, for example, the cancer cells in the liver are still lung cancer cells. • Different types of malignant tumor originate in different types of cell. 15. • Examples include: • Carcinoma: These tumors form from epithelial cells, which are present in the skin and the tissue that covers or lines the body's.

Chapter 4 - Cancer Flashcards - Questions and Answers

Subcutaneous lumps represent a heterogeneous category of cutaneous disorders that usually present as palpable nodules in the deeper extents of the skin and soft tissue. Angiolipomas and lipomas, comprised of vessels and benign adipose, or adipose alone, represent the most common entities in this category of disease. Other neoplasms in this category include metastatic, neural Malignant Tumors; Boundaries: Encapsulated or well circumscribed: Irregular and poorly circumscribed: This is the most valuable and the most reliable method to diagnose if the tumor is benign or malignant and even for staging the cancer. Example of certain tumor markers: Alpha-feto protein. INTRODUCTION Fibroadenomas are the second most common solid tumor after breast cancer and most common benign tumor in women. Painless, firm, solitary, mobile, slowly growing breast mass. It is the most common breast tumor in young women usually under 30 years of age and growth may be accelerated during pregnancy. It is usually detected when it.


20. odontogenic tumors Flashcards Quizle

Benign chest wall tumors are uncommon lesions that originate from blood vessels, nerves, bone, cartilage, or fat. Chest radiography is an important technique for evaluation of such tumors, especially those that originate from bone, because it can depict mineralization and thus indicate the diagnosis 10.1055/b-0039-171453 10 Eyelid and Periocular Tumors Abstract Eyelid and Periocular Tumors discusses these lesions, which are very common in patients referred to ophthalmologists. The main goal in the evaluation of these lesions is to differentiate malignant from benign lesions and to recognize the relevance of some lesions as markers of the potential for systemic malignancies The Basics on Brain Tumors. There are many kinds of brain tumors, benign and malignant, that can affect both children and adults. The central nervous system, which consists of the brain and spinal.

Tumors and Tumorous Conditions of the Hand

Chest wall tumors are rare. Like other cancers, tumors found in the chest wall may be malignant or benign. Malignant tumors must be treated. Benign tumors will be treated depending on where they are located and the symptoms they cause. If a tumor presses against a lung so that a patient can't breathe, for example, then it must be treated It is difficult to determine the risk attributable to one factor versus that attributable to other clinico-pathological features. 212 This is a critical clinical problem, and one such example is the emphasis on a benign outcome for encapsulated tumors with high-grade histology when invasion is absent. 213-215 Regarding the cut-off for % tumor. Benign neuroendocrine tumors have cells featuring differentiation and large nucleus and less cytoplasm. For example, insulinoma which is a pancreatic neuroendocrine tumor is common of benign origin and surgical resection can provide complete treatment from the tumor. One of the most common benign neuroendocrine tumors to be found is ganglioneuroma Neural Crest Cell Tumors (PNT = peripheral neuroblastic tumors) see: Case example with operative note ganglioneuroma of sympathetic chain pNTs are members of tumors derived from the neural crest cells. The neural crest cells are highly migratory and multipotent population that develop into many cell types and tissues throughout the body Neurofibroma Definition. A benign tumor consisting of a mixture of cell types, including Schwann cells, perineurial-like cells, fibroblastic cells and entrapped axons that may be well-demarcated if intraneural or cutaneous but are diffusely infiltrative if located in extraneural soft tissu

Brain Tumors: Which Ones Are Noncancerous

For example, if a brain tumor grows in the part of the brain that controls the right leg, you may have weakness or numbness in that leg. It might also give you seizures that involve the right leg. If you have a tumor in the part of the brain that controls language, you may have trouble speaking or understanding.. 2. This is an example of a UTERINE LEIOMYOMA, a benign tumor of smooth muscle cell origin. The uterus and tumor have been bisected. Note that this tumor is encapsulated and well-circumscribed, as would be expected in any benign neoplasm. 1 One hundred thirty five thyroid tumors diagnosed with follicular adenoma (FA, n=50), encapsulated minimally invasive follicular carcinoma (MIFC, n=40), and encapsulated follicular variant of papillary carcinoma (FVPC, n=45) were evaluated for immunohistochemically. For a single antibody, HBME-1 was the most sensitive antibody for the diagnosis. This tumor was benign, as is indicated by its long pre-surgery clinical history, encapsulation, bland cellular morphology, absence of necrosis or atypical mitotic figures, and recurrence-free. A benign lung tumor is an abnormal growth of tissue that serves no purpose and is found not to be cancerous. Benign lung tumors may grow from many different structures in the lung

Benign Neoplasm - an overview ScienceDirect Topic

A benign nerve sheath tumor that is typically encapsulated and composed entirely of well-differentiated Schwann cells. Alternate/Historical Names. Neurilemmoma; Neurinoma; Diagnostic Features. Alternating areas of compact spindle cells (Antoni A) and hypocellular less orderly areas (Antoni B) are characteristi Recent studies suggest that the encapsulated form of follicular variant papillary thyroid cancer (eFVPTC) behave more similarly to benign lesions and can be treated with thyroid lobectomy alone instead of total thyroidectomy. To distinguish aggressive cancers from more benign lesions more clearly, the objective of this study was to determine if. These tumors are sometimes dark in color. Cysts may also form. Although basal cell tumors are benign, they can be large and may cause extensive ulceration and secondary inflammation. These tumors can break the skin, cause the death of skin tissue, and drain fluid or pus. The dog is often uncomfortable These tumors make somatostatin, which helps regulate other hormones. Symptoms of this type of tumor can include belly pain, nausea, poor appetite, weight loss, diarrhea, symptoms of diabetes (feeling thirsty and hungry, and having to urinate often), and jaundice (yellowing of the skin and eyes). The early symptoms of a somatostatinoma tend to.

Examples of benign tumors include: Adenomas. Adenomas develop in glandular epithelial tissue, which is the thin membrane that covers glands, organs, and other structures in the body A cancer that arises from the connective tissue of the body. Examples include angiosarcoma (arising from blood vessels) and leiomyosarcoma (arising from smooth muscle cells). A benign, stromal tumor composed of admixed rounded and spindled cells, arranged in cellular nodules in a hypocellular, edematous or collagenous background stroma 768 CANCER February 15 1985 VOl.55 Four typical cases demonstrating benign or malignant disease are reported. Examples of the calculation of the histologic index are given. Case Reports Patient 1 A 23-year-old woman had a slowly developing Cushing's syndrome. At operation, a well-encapsulated tumor measurin A benign tumor is a mass of cells (tumor) that lacks the ability to either invade neighboring tissue or metastasize (spread throughout the body). When removed, benign tumors usually do not grow back, whereas malignant tumors sometimes do. Unlike most benign tumors elsewhere in the body, benign brain tumors can be life-threatening. Benign tumors generally have a slower growth rate than.

Benign cystic teratomas: These tumors are also called dermoid cysts because although derived from all 3 germ cell layers, they consist mainly of ectodermal tissue. Fibromas: These slow-growing connective tissue tumors are usually < 7 cm in diameter. Cystadenomas: These tumors are most commonly serous or mucinous A breast tumor may be unilateral (in one breast) or bilateral (in both breasts). It may be either benign or malignant. Types of Benign Breast Tumors. Benign breast tumors are usually soft in consistency and mobile (not fixed). These are slow-growing masses with a clearly demarcated margin or may be encapsulated therefore its removal is fairly easy

Chondroma. Chondromas are very rare benign tumors made of bone cartilage found in the skull. Both the skull base and the paranasal sinuses contain cartilage. Chondromas can develop in this cartilage, typically in people between the ages of 10 and 30. These tumors grow slowly, but eventually may cause the bone to fracture or grow too much. Benign Tumors. Benign tumors may occur on the skin or near vital organs of the dog's body. The tumors will typically have a regular shape, will not grow in time and will not spread to other organs. The tumors are normally encapsulated in fibrous tissue. Diagnosing Benign Tumors. There are a few visual tests that may be performed to detect if. 35) Among the differences between benign and malignant tumors is that the former become surrounded by a capsule, consisting of a fairly dense wrapping or coating of type I collagen fibers applied to it by fibroblasts in the surrounding tissue. Benign tumors are encapsulated and malignant cancers are not encapsulated For example, a tumor may contain hair, teeth, bone. In rare cases even more complex organs such as eyes or hands can be found inside the tumor. Teratoma can be made of one cyst or has within its capsule several fluid-filled cysts. These tumors are encapsulated and considered benign

A benign tumor is a mass of cells that lacks the ability to either invade neighboring tissue or metastasize (spread throughout the body). When removed, benign tumors usually do not grow back, whereas malignant tumors sometimes do. Unlike most benign tumors elsewhere in the body, benign brain tumors can be life-threatening. Benign tumors generally have a slower growth rate than malignant tumors. A benign tumor is a mass of cells that lacks the ability to invade neighboring tissue or metastasize.These characteristics are required for a tumor to be defined as cancerous and therefore benign tumors are non-cancerous. Also, benign tumors generally have a slower growth rate than malignant tumors and the tumor cells are usually more differentiated (cells have normal features) A rapidly growing tumor is more likely to be malignant than one that develops slowly. Benign tumors are relatively avascular, whereas most malignancies are hypervascular. The type of sarcoma, its size, location, stage and histologic grade (low, intermediate, high [or I, II, III]), which depends on the degree of differentiation, the number of. This term is a synonym for encapsulated follicular variant of papillary thyroid carcinoma; assign 26 Tectal plate lipoma This brain tumor is a benign neoplasm of the mid brain (brain stem). (except as noted in reportable examples list) For the purposes of cancer registry reporting, they are not synonymous with in situ for tumors in the. long arm of chromosome 17, 1 and the neurofibromatosis type 2 locus is near the center of the long arm of chromosome 22. 1 • 2 a 28 Benign nerve sheath tumors of the spinal nerve roots commonly occur sporadically as well as in both types of neurofibromatosis.' 2,21,23 These tumors may not be distinguished radiologically or at the time of.

Malignant vs. Benign Tumor Difference Between Malignant ..

Tumor. Signet Ring Adenocarcinoma, also commonly called Signet Ring Cell Carcinoma, receives its name from the fact that when looking at the cell under a microscope, the cell is so full of mucous that the nucleus of the cell (which would normally be near the cell's center), is pushed to the edges, or periphery, of the cell.This makes the cell look like signet ring jewelry under a microscope A benign neoplasm or benign tumor is a tumor that lacks all three of the malignant properties of a cancer.Thus, by definition, a benign tumor: does not grow in an unlimited, aggressive manner does not invade surrounding tissues; does not metastasize; Common examples of benign tumors include moles and uterine fibroids.. The term benign implies a mild and nonprogressive disease, and indeed. Thymoma and thymic carcinoma (collectively termed thymic epithelial tumors [TETs]) are relatively rare tumors arising from the thymus. Although infrequent, TETs are the most common tumors of the anterior mediastinum in adults. TETs, particularly thymomas, have unique biological properties and are associated with autoimmune paraneoplastic diseases Malignant neoplasms are more common, by far, than benign tumors in the lower respiratory tract. In the United States, lung carcinoma is the leading cause of cancer-related death in both sexes, and it accounts for more than 0.7% of new malignancies each year in men. 1 In Europe, the situation is even worse; for example, more than 3.0% of newly diagnosed malignant neoplasms in Germany are lung.

Benign tumors don't necessarily turn into malignant tumors. Some have the potential, though, to become cancerous if abnormal cells continue to change and divide uncontrollably Non-invasive follicular thyroid neoplasm with papillarylike nuclear features (NIFTP) is a new name for a very low risk thyroid tumor previously known as an Encapsulated Non-invasive Follicular Variant Papillary Thyroid Carcinoma. Although the cells in a NIFTP have features that look like papillary thyroid cancer, this finding alone does not mean NIFTPs are malignant Malignant and benign (non-cancerous) brain tumors have similar symptoms. They can cause seizures or cause neurologic problems, such as paralysis and speech difficulties. The difference between the two is that malignant tumors are cancerous and can spread rapidly into other parts of the brain, sending cancerous cells into surrounding tissue Patients whose tumors are fully encapsulated with no evidence of invasion can expect postoperative survival equal to that of the general population. Invasive tumors have a poorer prognosis, with 50% to 77% 5-year and 30% to 55% 10-year survival. Thymoma recurs after resection in nearly a third of patients - For example, as adenomas slowly expand, most develop an enclosing fibrous capsule separating them from the host tissue and this capsule probably is derived from the stroma of the host tissue and the stroma of the tumor •Note: Not all benign neoplasms are encapsulated. - For example, the leiomyoma of the uterus is discretel

They may be encapsulated and be well demarcated (meaning it has boundary). A benign tumor, though not invasive, will continue to grow larger. These types of growths can and do press on adjacent organs and cause difficulty with mobility and function. Because benign tumors are not invasive, many respond well to surgical intervention Example of surgical resection of a benign cooperative nerve sheath tumor (schwannoma) involving the upper trunk of the left brachial plexus in a middle aged woman. A , preoperative magnetic resonance imaging scan visualizing a circular mass within the upper trunk of the left brachial plexus ( white arrow ) Biliary adenofibroma is a rare benign biliary tumor of unknown etiology, first described in 1993 . It features dilated tubules lined by cuboidal epithelium, set in a dense fibrous stroma. In this sense, it resembles an enlarged version of a von Meyenburg complex, an entity with which it shares immunohistochemical characteristics

What is the Difference between Benign and Malignant Tumors

A benign tumor is a mass of cells that lacks the ability to either invade neighboring tissue or metastasize (spread throughout the body). When removed, benign tumors usually do not grow back, whereas malignant tumors sometimes do. Unlike most benign tumors elsewhere in the body, benign brain tumors can be life-threatening. [1] Benign tumors generally have a slower growth rate than malignant. Benign adrenocortical tumors are generally small (<70 Hough' used a metastasis-free survival of 5 years as g), rounded, encapsulated, and have a yellow cut surface, the criterion for the benign state of adrenocortical in which dark or brown foci may be seen Differing cellular growth patterns and tumor encapsulation instigate the contrasting mor-phology between benign and malignant tumors [20]. Initially, benign tumors grow acutely, but the growth stabilizes with a fastidious cellular metabolism [22]. In contrast, malig-nant tumors develop with an unstable growth engendered by a chaotic cellular. Papillary neoplasms of the breast encompass a wide range of tumor types ranging from the benign intraductal papilloma to in situ and invasive papillary carcinomas. In this review, we considered. Benign epithelioid peripheral nerve sheath tumors (BEPNSTs) have not been fully characterized, and their relationship to conventional schwannoma and neurofibroma has not been satisfactorily established. Herein, we detail the clinicopathologic features of 33 examples of BEPNST. The study included 22 females and 11 males ranging in age from 2 to 68 years (median, 31.5 years)

Brain tumors: overview of types, diagnosis, treatment

Benign neural tumors of the oral cavity: a comparative