oncocytoma

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on·co·cy·to·ma

(ong'kō-sī-tō'mă), [MIM*553000]
A glandular tumor composed of large cells with cytoplasm that is granular and eosinophilic because of the presence of abundant mitochondria; occurs uncommonly in the kidney, salivary glands, and endocrine glands.
Synonym(s): oxyphil adenoma
[onco- + G. kytos, cell, + -oma, tumor]

oncocytoma

/on·co·cy·to·ma/ (ong″ko-si-to´mah)
1. a usually benign adenoma composed of oncocytes with granular, eosinophilic cytoplasm.
2. a benign Hürthle cell tumor.

renal oncocytoma  a benign neoplasm of the kidney resembling a renal cell carcinoma but encapsulated and not invasive.

oncocytoma

A usually benign tumor characterized by aggregates of bland pink cells Locations Bronchial, lacrimal, salivary, parathyroid, and thyroid glands–Hürthle cell adenoma, anterior pituitary, kidney; rarely, malignant oncocytomas occur in salivary glands, nasal cavity, paranasal sinuses, mediastinum and thyroid and kidneys DiffDx Oncocytic CA of pancreas, oncocytic carcinoid of lungs, clinically similar to 'garden variety' carcinoid, oncocytosis of salivary gland, an age-related hyperplasia

on·co·cy·to·ma

(ong'kō-sī-tō'mă) [MIM*553000]
A glandular tumor composed of large cells with cytoplasm that is granular and eosinophilic because of the presence of abundant mitochondria; occurs uncommonly in the kidney and salivary and endocrine glands.

oncocytoma (ong´kōsītō´mə),

n a rare, benign tumor usually occurring in the parotid glands in older patients. The lesion is encapsulated and composed of sheets and cords of large eosinophilic cells with small nuclei. Also called
acidophilic adenoma, oxyphilic adenoma.
Enlarge picture
Oncocytoma.

oncocytoma

a rare benign neoplasm arising from oncocytes.
References in periodicals archive ?
Renal oncocytoma revisited: a clinicopathological study of 109 cases with emphasis on problematic diagnostic features.
Cannabinoid CB1 receptor is expressed in chromophobe renal cell carcinoma and renal oncocytoma.
Most renal oncocytomas appear to grow: Observations of tumor kinetics with active surveillance.
The presence of variegated cytoplasm and frequent perinuclear clearing in ChRCC and presence of uniform large cells with abundant homogeneous granular cytoplasm, lacking perinuclear clearing, and nuclear membrane irregularities, helps in distinction from renal oncocytoma (1,2,6,7,9,11,12).
Immunohistochemical analysis of chromophobe renal cell carcinoma, renal oncocytoma, and clear cell carcinoma: an optimal and practical panel for differential diagnosis.
Distinguishing a renal oncocytoma from an eosinophilic variant of chromophobe RCC can sometimes be particularly challenging.
Traditionally, the standard treatment for renal oncocytoma has been surgical excision by radical nephrectomy.
Segmental enhancement inversion at biphasic multidetector CT: Characteristic finding of small renal oncocytoma.
23) Of the former 3, the tumor cannot be considered a renal oncocytoma if the characteristic cytological features (ie, irregular hyperchromatic nuclei with perinuclear halos) are noted even focally on biopsy.
Dear Editor, The clinical significance of papillary renal cell carcinoma (RCC) within renal oncocytoma remains unclear.
Overexpression of KIT (CD117) in chromophobe renal cell carcinoma and renal oncocytoma.
Cytologic features are among the major defining criteria of renal oncocytoma.