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| Oncocytoma Classification and external resources |
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| ICD-O: | 8290/0 |
|---|---|
| DiseasesDB | 31956 |
| eMedicine | med/1045 |
| MeSH | D018249 |
An oncocytoma is a kidney or salivary gland tumor made up of oncocytes, a special kind of cells. [1]
Contents |
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.
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.
See also
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:. PMID 17381809.
- ^ Robbins pathology, page 1015
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Wikipedia content modification information:
- This page was last modified on 20 August 2008, at 08:56.
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