Authors: Juan Xing, MD¹, Walid E. Khalbuss, MD PhD FIAC², Liron Pantanowitz, MD, MIAC²

1. Department of Pathology, Drexel University College of Medicine, Philadelphia, PA, USA
2. Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA

CASE HISTORY:

A 59 year old male presented to an outside institute with a slowly growing left-sided chest wall mass which was surgically resected. Six years later he recurred with a new chest wall mass and masses in his left lung and abdomen.. Now his chest wall mass has doubled in size. A FNA with air-dried Diff Quik stain and a cell block of the recurrent chest wall mass was performed.

Fig. 1 FNA direct smear of the recurrent left chest wall mass (DQ stain, Mag 40x)

Fig. 2 Cell block preparation showing tumor cells of the recurrent left chest wall mass (H&E stain; Mag 40x)

Fig. 3 Several immunostains performed on cell block material of the recurrent chest wall mass are shown.

What is the best interpretation for this case?