Case 50 Slide 2

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 55 year old woman with no significant past medical history presents with a large left renal mass. An ultrasound-guided fine needle aspiration of the mass was performed.

What is your diagnosis?