| malignant meningioma | <tumour> Meningioma that either invades brain parenchyma or metastasizes. (05 Mar 2000) |
|---|---|
| meningioma | <oncology, tumour> Common benign brain tumours that arise from the pia-arachnoid cells of the meninges. Meningiomas tend to occur along the superior sagittal sinus, along the sphenoid ridge or in the vicinity of the optic chiasm. See: primary brain tumour. (27 Sep 1997) |
| cutaneous meningioma | <tumour> A lesion in the skin and subcutis composed of meningeal cells; occurs as a developmental lesion in children or as an extension of an intracranial meningioma in adults. (05 Mar 2000) |
| psammomatous meningioma | <tumour> A firm cellular neoplasm derived from fibrous tissue of the meninges, choroid plexus, and certain other structures associated with the brain, characterised by the formation of multiple, discrete, concentrically laminated, calcareous bodies (psammoma bodies); most of these neoplasms are histologically benign, but may lead to severe symptoms as a result of compressing the brain. Synonym: angiolithic sarcoma, sand tumour, Virchow's psammoma. (05 Mar 2000) |
| optic nerve meningioma | <radiology> Female (80%), middle age, (24% occur before 10 yrs, but are associated with neurofibromatosis), tubular, hyperdense mass, intense tramtrack enhancement, ** Cf: optic nerve glioma (12 Dec 1998) |
| adenocarcinoma, papillary | An adenocarcinoma containing finger-like processes of vascular connective tissue covered by neoplastic epithelium, projecting into cysts or the cavity of glands or follicles. It occurs most frequently in the ovary and thyroid gland. (12 Dec 1998) |
| carcinoma, papillary | A malignant neoplasm characterised by the formation of numerous, irregular, finger-like projections of fibrous stroma that is covered with a surface layer of neoplastic epithelial cells. (12 Dec 1998) |
| carcinoma, papillary, follicular | A thyroid neoplasm of mixed papillary and follicular arrangement. Its biological behaviour and prognosis is the same as that of a papillary adenocarcinoma of the thyroid. (12 Dec 1998) |
| papillary | <anatomy> Pertaining to or resembling papilla or nipple. (18 Nov 1997) |
| papillary adenocarcinoma | <tumour> An adenocarcinoma containing finger-like processes of vascular connective tissue covered by neoplastic epithelium, projecting into cysts or the cavity of glands or follicles; occurs most frequently in the ovary and thyroid gland. (05 Mar 2000) |
| papillary adenoma of large intestine | <tumour> Appears as a solitary sessile, often large, tumour of colonic mucosa composed of mucinous epithelium covering delicate vascular projections; malignant change occurs frequently; hypersecretion occurs rarely. Also known as adenoma. Synonym: papillary adenoma of large intestine. (05 Mar 2000) |
| papillary carcinoma | <tumour> A malignant neoplasm characterised by the formation of numerous, irregular, finger-like projections of fibrous stroma that is covered with a surface layer of neoplastic epithelial cells. (05 Mar 2000) |
| papillary cystadenoma lymphomatosum | <oncology, tumour> A benign tumour characterised histologically by tall columnar epithelium within a lymphoid tissue stroma. It is usually found in the salivary glands, especially the parotid. (25 Jun 1999) |
| papillary cystic adenoma | <tumour> An adenoma in which the lumens of the acini are frequently distended by fluid, and the neoplastic epithelial elements tend to form irregular, fingerlike projections. (05 Mar 2000) |
| papillary ducts | The largest straight excretory duct's in the kidney medulla and papillae whose openings form the area cribrosa; they are a continuation of the collecting tubules. Synonym: Bellini's ducts. (05 Mar 2000) |