FNA Quiz 29 A 43 year-old woman who presented with vague abdominal symptoms was discovered to have a 5.5 cm well-circumscribed mass in the head of the pancreas and endoscopic ultrasound-guided fine needle aspiration biopsy of the mass was performed and illustrated below. Based on the cytomorphologic features illustrated below, the tumor cells would MOST LIKELY be immunoreactive for:

A Trypsin and lipase.

B CD10 and α-1-antitrypsin.

C S-100 protein and HMB45.

D Synaptophysin and chromogranin.

E None of the above.