Case 51 Slide 1

Author: Richard Cantley, MD. Cytopathology Fellow, McGaw Medical Center, Northwestern University, Chicago, USA

Reviewer: Ajit Singh Paintal, MD. Assistant Professor of Pathology, Northwestern University, Feinberg School of Medicine, Chicago, USA.

A 64 year old woman with no significant past medical history presents with a 2.8 cm mass in the mid-pole of the left kidney. CT-guided fine needle aspiration was performed.

Your diagnosis?