This is a papillary renal cell carcinoma removed by partial nephrectomy.
Macroscopic - Circumscribed, cortical-based, tan tumour with a cuff of renal parenchyma.
Microscopic (low power) - circumscribed lesion.
Microscopic (medium power) - well-defined interface of tumour and adjacent renal cortex (bottom left).
Microscopic (high power) - well-formed branching papillae with lining cells showing abundant eosinophilic cytoplasm and small uniform nuclei.