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Definition
 
enEnglish
Anus Neoplasms definition: Tumors or cancer of the ANAL CANAL.
Anal Neoplasm definition: A benign or malignant neoplasm involving the anus.
Cat-Scratch Disease definition: A self-limiting bacterial infection of the regional lymph nodes caused by AFIPIA felis, a gram-negative bacterium recently identified by the Centers for Disease Control and Prevention and by BARTONELLA HENSELAE. It usually arises one or more weeks following a feline scratch, with raised inflammatory nodules at the site of the scratch being the primary symptom.
Cementoma definition: An odontogenic fibroma in which cells have developed into cementoblasts and which consists largely of cementum.
Cementoblastoma definition: A rare benign bone-forming neoplasm usually arising from the jaw. It is a well-circumscribed lytic tumor that varies in size. The cell of origin is the cementoblast.
Hemangioma definition: A vascular anomaly due to proliferation of BLOOD VESSELS that forms a tumor-like mass. The common types involve CAPILLARIES and VEINS. It can occur anywhere in the body but is most frequently noticed in the SKIN and SUBCUTANEOUS TISSUE. (from Stedman, 27th ed, 2000)
hemangioma definition: extremely common benign tumor, occurring most commonly in infancy and childhood, made up of newly formed blood vessels, and resulting from malformation of angioblastic tissue of fetal life; can occur anywhere in the body but is most frequently noticed in the skin and subcutaneous tissues.
Hemangioma definition: A benign localized vascular neoplasm usually occurring in infancy and childhood. It is characterized by the formation of capillary-sized or cavernous vascular channels. The majority of cases are congenital.
Osteoblastoma definition: A benign, painful, tumor of bone characterized by the formation of osteoid tissue, primitive bone and calcified tissue. It occurs frequently in the spine of young persons. (From Dorland, 27th ed; Stedman, 25th ed)
Osteoblastoma definition: A rare benign bone-forming neoplasm usually arising from the spine. It is a well-circumscribed lytic tumor that varies in size. The tumor is composed of woven bone trabeculae and shares similar histologic characteristics with the osteoid osteoma. Surgical curettage is the treatment of choice. The prognosis is excellent.
Sarcoidosis definition: WHAT: Sarcoidosis: Sarcoidosis: a disorder of unknown etiology that affects many organ systems with noncaseating epithelioid cell granulomas. It has a special predilection for the lung and lymph tissues. WHY: Sarcoidosis can result in an acute arthritis commonly affecting the ankles and knees and less commonly the proximal interphalangeal joints, wrists, and elbows. The acute arthritis is symmetric and lasts for a few weeks. A less common chronic arthritis is destructive and may have dactylitis and telescoping digits. HOW: Sarcoidosis is a diagnosis of exclusion based on the clinical presentation and histology of biopsy tissue.
Sarcoidosis definition: An idiopathic systemic inflammatory granulomatous disorder comprised of epithelioid and multinucleated giant cells with little necrosis. It usually invades the lungs with fibrosis and may also involve lymph nodes, skin, liver, spleen, eyes, phalangeal bones, and parotid glands.
sarcoidosis definition: inflammatory disease characterized by small lumps or granulomas in lymph nodes and other organs.
Benign Thymoma definition: A thymoma that is completely surrounded by a capsule, without evidence of capsular invasion, infiltration of the surrounding tissues, and metastases.
benign tumor definition: (beh-NINE) A noncancerous growth that does not invade nearby tissue or spread to other parts of the body.
Benign Neoplasm definition: A neoplasm which is characterized by the absence of morphologic features associated with malignancy (severe cytologic atypia, tumor cell necrosis, and high mitotic rate). Benign neoplasms remain confined to the original site of growth and only rarely metastasize to other anatomic sites.
Benign Adrenal Gland Neoplasm definition: A non-metastasizing neoplasm arising from the adrenal gland. (NCI05)
benign definition: (beh-NINE) Not cancerous; does not invade nearby tissue or spread to other parts of the body.
Benign definition: For neoplasms, a non-infiltrating and non-metastasizing neoplastic process that is characterized by the absence of morphologic features associated with malignancy (e.g., severe atypia, nuclear pleomorphism, tumor cell necrosis, and abnormal mitoses). For other conditions, a process that is mild in nature and not dangerous to health.
Adrenocortical Adenoma definition: A benign neoplasm of the ADRENAL CORTEX. It is characterized by a well-defined nodular lesion, usually less than 2.5 cm. Most adrenocortical adenomas are nonfunctional. The functional ones are yellow and contain LIPIDS. Depending on the cell type or cortical zone involved, they may produce ALDOSTERONE; HYDROCORTISONE; DEHYDROEPIANDROSTERONE; and/or ANDROSTENEDIONE.
Adrenal Cortex Adenoma definition: A benign neoplasm that can arise from any of the adrenal cortical layers. It can be associated with the overproduction of glucocorticoids (Cushing's syndrome), androgenic or estrogenic steroids (adrenogenital syndrome), or mineralocorticoids (Conn's syndrome). (Sternberg Diagnostic Surgical Pathology, 3rd ed.)
Adenoma, Liver Cell definition: A benign epithelial tumor of the LIVER.
Hepatocellular Adenoma definition: A benign epithelial neoplasm arising from the hepatocytes. Grossly, it appears as a soft, round mass which often contains areas of hemorrhage and necrosis. Morphologically, the neoplastic cells resemble normal hepatocytes and form plates separated by sinusoids. Most patients have a history of contraceptive or anabolic steroids use.
Adenomatoid Tumor definition: A small, circumscribed, benign tumor of the genital tract, composed of small glandlike spaces lined by flattened or cuboidal mesothelium-like cells. (From Dorland, 27th ed)
Adenomatoid Tumor definition: A benign neoplasm arising from mesothelial cells. It is characterized by the formation of glandular and tubular patterns. It can occur in several anatomic sites including the pleura, peritoneum, and epididymis.
Pilomatrixoma definition: A tumor composed of cells resembling those of the hair matrix, which undergo 'mummification' and may calcify. It is a relatively uncommon tumor, which may occur at any age from infancy. The majority of patients are under 20, and females are affected more than males. The lesion is usually a solitary deep dermal or subcutaneous tumor 3-30 mm in diameter, situated in the head, neck, or upper extremity. (From Rook et al., Textbook of Dermatology, 4th ed, p2401)
Pilomatricoma definition: A benign adnexal neoplasm arising from hair-bearing skin surfaces, usually the head and neck and upper extremities. It usually presents as a solitary, slow-growing nodular mass. Morphologically, it displays differentiation towards the matrix and inner sheath of the normal hair follicle and the hair cortex. Complete surgical excision is usually curative. Occasionally, it may recur.
Benign Synovial Neoplasm definition: A benign neoplasm arising from the synovial membrane. Examples include the diffuse giant cell tumor of tendon sheath and localized giant cell tumor of tendon sheath.
Benign Meningioma definition: A benign growth that originates from the arachnoidal cap cells or the meningothelial cells, rarely invading brain parenchyma. The usual form of treatment is attempted gross total neurosurgical resection. These tumors tend to recur if incompletely excised (Kaye AH, Laws ER Brain Tumors Churchill Livingstone 1995)
Benign Epithelial Neoplasm definition: A neoplasm arising from the epithelial cells. It is characterized by the absence of morphologic features associated with malignancy (severe cytologic atypia, tumor cell necrosis, and high mitotic rate). Benign epithelial neoplasms remain confined to the original site of growth and only rarely metastasize to other anatomic sites.
Tumorlet definition: A tiny localized pulmonary nodule characterized by neuroendocrine cell proliferation. It is usually discovered as an incidental finding during routine histologic examination of tissue sections or during radiologic examination.
Benign Paraganglioma definition: A paraganglioma that is confined to the site of origin, without metastatic potential.
Benign Mesenchymoma definition: A term describing a benign soft tissue tumor which consists of two or more mesenchymal lines of differentiation, excluding a fibroblastic line of differentiation.
Benign Mesonephroma definition: A benign epithelial neoplasm of the female reproductive system arising from mesonephric remnants.
Benign Hemangioendothelioma definition: A benign vascular proliferation characterized by the presence of prominent endothelial cells and the formation of vascular channels.
Benign Hemangiopericytoma definition: A hemangiopericytoma without malignant morphologic or clinical characteristics.
Benign Lipomatous Neoplasm definition: A benign tumor composed of adipose (fatty) tissue. The most common representative of this category is the lipoma.
Benign Gastrointestinal Neoplasm definition: A non-metastasizing neoplasm arising from any part of the gastrointestinal system.
Benign Nervous System Neoplasm definition: Abnormal growth of cells in the nervous system without evidence of malignant characteristics. Unlike other organ systems, tumors in the central nervous system can have benign histological characteristics but still have life threatening effects due to their location within the neuraxis (e.g., brainstem gliomas).
Benign Adrenal Medulla Neoplasm definition: A non-metastasizing neoplasm arising from the adrenal medulla. (NCI05)
Benign Schwannoma definition: A slowly growing, benign, usually encapsulated tumor, composed of neoplastic differentiated Schwann cells. Although it can affect any age, it is more commonly seen in the fourth to sixth decades of life. It usually occurs in the peripheral nerves of the head and neck regions and the extensor aspects of the extremities. It rarely undergoes malignant transformation.
Benign Schwannoma definition: (shwah-NO-ma)
Benign Schwannoma definition: A tumor of the peripheral nervous system that arises in the nerve sheath (protective covering). It is almost always benign, but rare malignant schwannomas have been reported.
Benign Ameloblastoma definition: An ameloblastoma that does not recur or metastasize.
Benign Adrenal Cortex Neoplasm definition: A non-metastasizing neoplasm arising from the adrenal cortex. (NCI05)
Mature Teratoma definition: A teratoma which may be cystic; it is composed entirely of well differentiated, adult-type tissues, without evidence of fetal-type tissues.
Benign Adrenal Gland Pheochromocytoma definition: A sporadic or familiar pheochromocytoma that is confined to the adrenal gland and does not have any metastatic potential. The majority of cases are sporadic, and usually unilateral. Familiar cases are usually bilateral.
Benign Sertoli Cell Tumor definition: A Sertoli cell tumor of the testis or the ovary which remains localized and does not metastasize to another anatomic site.
Benign Teratoma definition: A teratoma with benign morphologic features without metastatic potential.
Benign Myoepithelioma definition: A benign neoplasm with myoepithelial differentiation that lacks an infiltrative growth pattern and does not metastasize.
Mastocytoma definition: A solid tumor consisting of a dense infiltration of MAST CELLS. It is generally benign.
Benign Mastocytoma definition: A localized mast cell neoplasm without metastatic potential.
Benign Carotid Body Paraganglioma definition: A carotid body paraganglioma that is confined to the site of origin, without metastatic potential.
 
 
itItalian
benigno definition: [1] benigne, gutartig