From Wikipedia, the free encyclopedia
Gross appearance of the cut surface of a
nephrectomy specimen containing a
renal oncocytoma. Note the rounded contour, the mahogany colour and the central scar.
An oncocytoma is a kidney or salivary gland tumor made up of oncocytes, a special kind of cells. [1]
[edit] Presentation
An oncocytoma is an epithelial tumor composed of oncocytes, large eosinophilic cells having small, round, benign-appearing nuclei with large nucleoli. It is thought to arise from the intercalated cells of collecting ducts of the kidney. It represent 5% to 15% of surgically resected renal neoplasms. Ultrastructurally, the eosinophilic cells have numerous mitochondria. In gross appearance, the tumors are tan or mahogany brown, well circumscribed and contain a central scar. They may achieve a large size (up to 12 cm in diameter). Renal oncocytoma is considered benign, cured by nephrectomy. There are some familial cases in which these tumors are multicentric rather than solitary. [2]
The salivary gland oncocytoma is a well-circumscribed, benign neoplastic growth also called an oxyphilic adenoma. It comprises about 1% of all salivary gland tumors. The histopathology is marked by sheets of large swollen polyhedral epithelial oncocytes, which are granular acidophilic parotid cells with centrally located nuclei. The granules are created by the mitochondria.
[edit] Symptoms
Most cases are asymptomatic, discovered incidentally (by chance) on a tomography or ultrasound of the abdomen. Following are some of the possible symptoms : Hematuria, flank pain, abdominal mass.
Salivary gland oncocytomas are most common in ages 70-80, females, the parotid gland (85-90%), and are firm, slowly growing, painless masses of < 4 cm. They may be bilateral.
[edit] See also
[edit] References
- ^ Coburn V, Radfar A, Snook D, Mahalingam M (2007). "Cutaneous oncocytoma - a report of three cases and review of the literature". J. Cutan. Pathol. 34 (4): 355–9. doi:10.1111/j.1600-0560.2006.00620.x. PMID 17381809.
- ^ Robbins pathology, page 1015
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Pathology: Cancer, Tumors, Neoplasms, and oncology (C00-D48, 140-239) |
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| Benign tumors |
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| Malignant progression |
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| Topography |
lip, oral cavity and pharynx: Oral - Head/Neck - Nasopharyngeal
digestive system: tract (Esophagus, Stomach, Small intestine, Colon/rectum, Appendix, Anus) - glands (Liver, Bile duct, Gallbladder, Pancreas)
respiratory system: Larynx - Lung
bone, articular cartilage, skin, and connective tissue: Bone (Tailbone) - Skin - Blood
urogenital: breast and female genital organs (Breast, Vulva, Vagina, Cervix, Uterus, Endometrium, Ovaries) - male genital organs (Penis, Prostate, Testicles) - urinary organs (Kidney, Bladder)
nervous system: Eye (Uvea) - Brain (Choroid plexus)
endocrine system: Thyroid ( Papillary, Follicular, Medullary, Anaplastic) - Adrenal tumor ( Adrenocortical carcinoma, Pheochromocytoma) - Pituitary
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