benign renal tumours

Question 1

what are the two main types of benign renal tumours?

Answer 1

• oncocytoma

- angimyolipoma

Question 2

what is an oncocytoma?

Answer 2

-benign tumour of oncocytes (epithelial cells with excessive amounts of mitochondria)

Question 3

how does oncocytoma present?

Answer 3

• 85% of time it is incidental
• loin pain
• haematuria

Question 4

how does oncocytoma present on CT?

Answer 4

spoke wheel pattern (very similar to clear cell RCC)

Question 5

how does oncocytoma present on biopsy?

Answer 5

small ,oval and well circumscribed

• mahogany brown with a central stellate scar
• very pink and granular cytoplasm
• Aggregates of eosinophilic cells, mitosis is rare and cells packed with mitochondria

Question 6

are oncocytomas known to metastasise?

Answer 6

no

Question 7

what is the management for oncocytoma?

Answer 7

observation 4-5 years if proven on biopsy