Cellular hamartoma resembling gastrointestinal stromal tumor: a solid tumor of the pancreas expressing c-kit (CD117)

Solid tumors of the pancreas are usually neoplastic. We report on two adult patients, each with a solid tumor of the pancreas that presented with an unusual histology and seemed to follow a benign course. The tumors, one located in the body and one in the tail, were well demarcated and composed of i...

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Veröffentlicht in:Modern pathology 2005-09, Vol.18 (9), p.1211-1216
Hauptverfasser: Pauser, Ursula, da Silva, Maria T S, Placke, Jörg, Klimstra, David S, Klöppel, Günter
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Sprache:eng
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Zusammenfassung:Solid tumors of the pancreas are usually neoplastic. We report on two adult patients, each with a solid tumor of the pancreas that presented with an unusual histology and seemed to follow a benign course. The tumors, one located in the body and one in the tail, were well demarcated and composed of irregularly arranged but well-differentiated acini and small intralobular and interlobular ducts embedded in predominantly hypocellular fibrotic tissue that contained fascicles of cytologically bland spindle cells. Islets were lacking, but immunohistochemical staining for chromogranin A and insulin revealed individual scattered insulin-producing cells distributed between acinar and ductal cells. The spindle cell component tissue showed coexpression of CD34, c-kit (CD117) and bcl-2. The follow-up (2 and 4 years) of the patients was uneventful. We propose to designate the tumors as ‘cellular hamartoma resembling gastrointestinal stromal tumor.'
ISSN:0893-3952
1530-0285
DOI:10.1038/modpathol.3800406