Renal oncocytosis

Renal oncocytosis is the presence of multiple oncocytic lesions within the kidney.

General

• Rare.
• May be seen in the context of Birt–Hogg–Dubé syndrome or renal failure or may be sporadic.

Gross

• Multiple (unilateral or bilateral) brown-coloured nodules.

Microscopic

Features:

• Any mixture of oncocytic tumours (hybrid tumour, chromophobe renal cell carcinoma, renal oncocytoma).

DDx:

• Hybrid tumour.
• Chromophobe renal cell carcinoma.
• Renal oncocytoma.
• Other renal tumours with eosinophilic cytoplasm.

See also

• Renal tumours.