From the case: Upper tract urothelial carcinoma
Left kidney - Pathology
x1 Gross pathology
There is a relatively circumscribed but unencapsulated pale lesion in the upper to mid pole of the left kidney. The lesion extends from the medulla, where there is a fungiform protrusion into the renal calyx, all the way to the perinephric surface; there is focal extension into the perinephric fat in a more posterior slice (not shown).