A wolf in sheep's clothing: a non-functioning islet cell tumor of the pancreas masquerading as a microcystic (serous cystic) adenoma.
BACKGROUND
The endosonographic appearance of a microcystic "honeycomb" lesion of the pancreas usually indicates a serous cystic adenoma.


METHODS
We report a case of a non-functioning islet cell tumor that has the typical microcystic "honeycomb" appearance of a serous cystic adenoma. The implications for endoscopic ultrasound diagnosis and management of cystic pancreatic lesions are discussed.


CONCLUSIONS
Islet cell tumors are a rare differential diagnosis of microcystic pancreatic lesions. If fine needle aspiration remains non-diagnostic preoperative distinction from serous cystic adenomas may be impossible.
Gerke
Henning
H
Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, NC, USA. henninggerke@web.de
Byrne
Michaell F
MF
Xie
Huiwen Bill
HB
Paulson
Erik K
EK
Tyler
Douglas S
DS
Baillie
John
J
Jowell
Paul S
PS
D000236:Adenoma / Q000175:diagnosis*; D007516:Adenoma, Islet Cell / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000175:diagnosis*