| dysembryoplastic neuroepithelial tumour | A rare low grade neoplasm most frequently seen in children and associated with seizures and cortical dysplasia; the often multinodular, multicystic tumour is comprised of an oligodendroglial-like background with accompanying neurons. (05 Mar 2000) |
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| innocent tumour | <oncology> A nonmalignant clone of neoplastic cells that does not invade locally or spread to other parts of the body (metastasise), having lost growth control but not positional control. Usually surrounded by a fibrous capsule of compressed tissue. (29 Sep 1997) |
| interstitial cell tumour of testis | <tumour> A small benign tumours of the testis that often produce testosterone, causing endocrine symptoms. Synonym: interstitial cell tumour of testis. (05 Mar 2000) |
| oil tumour | A nodule or focus of granulomatous inflammation (usually of the foreign-body type) in association with lipid material deposited in tissues, e.g., after the injection of certain oils. See: paraffinoma. Synonym: eleoma, oil tumour, oleogranuloma, oleoma. (05 Mar 2000) |
| oncocytic hepatocellular tumour | <tumour> Primary hepatic carcinoma in which malignant hepatocytes are intersected by fibrous lamellated bands. Synonym: oncocytic hepatocellular tumour. (05 Mar 2000) |
| organoid tumour | A tumour of complex structure, glandular in origin, containing epithelium, connective tissue, etc. (05 Mar 2000) |
| ovarian granulosa-theca cell tumour | <radiology> Any age, most benign, oestrogens may lead to isosexual precocious puberty (pathognomonic), large tumour with areas of cystic degeneration (12 Dec 1998) |
| ovarian tumour | <gynaecology, oncology> A malignant tumour of the ovary is the leading cause of death from gynaecologic malignancies. Often diagnosed in later stages, symptoms include abdominal pain, increasing abdominal girth and abnormal uterine bleeding. Birth control pill use is thought to reduce the risk of ovarian cancer. (05 Jan 1998) |
| teratoid tumour | <oncology, tumour> Malignant tumour (teratoma) thought to originate from primordial germ cells or misplaced blastomeres that contains tissues derived from all three embryonic layers, such as bone, muscle, cartilage, nerve, tooth buds and various glands. Accompanied by undifferentiated, pluripotent epithelial cells known as embryonal carcinoma cells. (16 Dec 1997) |
| theca cell tumour | A sex cord-stromal tumour of the postmenopausal ovary that is yellow, large, and unilateral, composed of fascicles of lipid-rich spindle cells interspersed with collagen, reticulin fibres, and hyaline plaques. Thecomas and other oestrogen-producing tumours (e.g., granulosa cell tumours) may induce adenomatous hyperplasia of the endometrium or well-differentiated endometrial carcinoma in 3%-20% of the cases. (12 Dec 1998) |
| ear tumour | A disorder where there are noncancerous lumps or growths within the ear canal or on the pinna of the ear (external ear). most lumps are sebaceous cysts but some are bony overgrowths known as exostoses (or osteomas). If large enough they may interfere with hearing. In this case surgical removal may be required. (27 Sep 1997) |
| eighth nerve tumour | <tumour> A benign neoplasm of the intracranial segment of the eighth cranial nerve, producing cerebellar, lower cranial nerve, and brainstem signs and symptoms. Synonym: acoustic neuroma, cerebellopontine angle tumour, eighth nerve tumour. (05 Mar 2000) |
| embryonal tumour | Embryonic tumour, a neoplasm, usually malignant, which arises during intrauterine or early postnatal development from an organ rudiment or immature tissue; it forms immature structures characteristic of the part from which it arises, and may form other tissues as well. The term includes neuroblastoma and Wilms' tumour, and is also used to include certain neoplasms presenting in later life, this usage being based on the belief that such tumours arise from embryonic rests. See: teratoma. Synonym: embryoma. (05 Mar 2000) |
| embryonal tumour of ciliary body | <tumour> An epitheliomatous tumour of the nonpigmented layer of the ciliary epithelium. Synonym: embryonal tumour of ciliary body. (05 Mar 2000) |
| endocervical sinus tumour | Malignant germ cell tumour commonly found in the ovary. The tumour arises from primitive germ cells and develops into extra-embryonic tissue resembling the yolk sac. Synonym: yolk sac carcinoma. (05 Mar 2000) |