| Hurthle cell adenoma | <tumour> An uncommon type of thyroid tumour characterised by abundant eosinophilic cytoplasm containing numerous mitochondria. Often malignant with widespread metastases; rarely takes up radioiodine. See: Hurthle cell tumour. (05 Mar 2000) |
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| somatotrophic adenoma | <radiology> Elevated growth hormone (greater than10 ng/ml), gigantism, acromegaly see: pituitary adenoma (12 Dec 1998) |
| nephrogenic adenoma | <tumour> A benign tumour of the urinary bladder mucosa, composed of glandular structures resembling renal tubules. (05 Mar 2000) |
| null-cell adenoma | <tumour> An adenoma of the hypophysis composed of cells for which there is no overt evidence or hormone production, but which usually produces hypopituitarism and visual disturbances by compression of adjacent structures; approximately one third of these tumours have cells with abundant mitochondria (oncocytes) that are somewhat larger than the monocytic null cells. Synonym: undifferentiated cell adenoma. (05 Mar 2000) |
| islet cell adenoma | <tumour> A benign neoplasm of the pancreas composed of tissue similar in structure to that of the islets of Langerhans; it may contain functioning beta cells, and may cause hypoglycaemia. See: insulinoma. Synonym: nesidioblastoma. (05 Mar 2000) |
| ovarian tubular adenoma | <oncology, tumour> A type of ovarian tumour whose sells secrete a male sex hormone (testosterone) causing virilisation in women. (27 Sep 1997) |
| oxyphil adenoma | <tumour> A glandular tumour composed of large cells with cytoplasm that is granular and eosinophilic due to the presence of abundant mitochondria; occurs uncommonly in the kidney, salivary glands, and endocrine glands. Synonym: oxyphil adenoma. Origin: onco-+ G. Kytos, cell, + -oma, tumour (05 Mar 2000) |
| testicular tubular adenoma | A neoplasm of the ovary, arising from the ovarian stroma, mimicking to a greater or lesser extent derivatives of the sex cord mesenchyme of the testis, and sometimes causing defeminization and virilization. (12 Dec 1998) |
| thyrotropin-producing adenoma | <tumour> A rare pituitary adenoma usually associated with hypo-or hyperthyroidism. (05 Mar 2000) |
| embryonal adenoma | <tumour> A benign neoplasm in which the glandular epithelial elements are not fully differentiated, resembling immature tissue observed in embryonic development. (05 Mar 2000) |
| eosinophil adenoma | <endocrinology, oncology, tumour> A benign tumour, usually found in the anterior lobe of the pituitary gland, whose cells stain with acid dyes. Such pituitary tumours may give rise to excessive secretion of growth hormone, resulting in gigantism or acromegaly. A specific type of acidophil adenoma may give rise to nonpuerperal galactorrhoea. (25 Jun 1999) |
| tubular adenoma | <tumour> A benign neoplasm composed of epithelial tissue resembling a tubular gland. (05 Mar 2000) |
| undifferentiated cell adenoma | <tumour> An adenoma of the hypophysis composed of cells for which there is no overt evidence or hormone production, but which usually produces hypopituitarism and visual disturbances by compression of adjacent structures; approximately one third of these tumours have cells with abundant mitochondria (oncocytes) that are somewhat larger than the monocytic null cells. Synonym: undifferentiated cell adenoma. (05 Mar 2000) |
| fibroid adenoma | <oncology, tumour> A benign solid growth, usually found in the breast. (09 Oct 1997) |
| lactating adenoma | <tumour> An uncommon adenoma of the breast composed of tubuloacinar structures with pronounced secretory changes such as seen in pregnancy and lactation. (05 Mar 2000) |