Renal oncocytoma

Case contributed by Dr Andrew Ryan


Incidental finding on CT scan.

Patient Data

Age: 50 years
Gender: Male

Coronal section of right kidney ('bivalved'). There is a round, tan tumour, 15mm in diameter, bulging into the hilar fat; it is quite hard to see because of similar colour to the surrounding renal parenchyma. There is an incidental lower pole simple cortical cyst.


Histo (low power) - There are rounded to angular 'islands' of tumour cells surrounded by pale oedematous stroma. This pattern is sometimes referred to as 'archipelangenous'  - from archipelago (see next picture).

Histo (high power) - well circumscribed nests of relatively uniform tumour cells with abundant eosinophilic (so-called 'oncocytic') cytoplasm. There is no significant atypia, mitotic activity or necrosis.


View of an island 'archipelago'. Photo courtesy of Radoslaw Botev from Wikimedia Commons.

PlayAdd to Share

Case information

rID: 16160
Published: 24th Dec 2011
Last edited: 11th Apr 2018
System: Urogenital
Inclusion in quiz mode: Excluded

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.