Extragastrointestinal stromal tumor of lesser omentum: a challenging radiological and histological diagnosis.
Extragastrointestinal stromal tumors (EGISTs) are a rare subgroup of gastrointestinal stromal tumors (GISTs), arising from outside the walls of gastrointestinal tubular organs. We report a case of an EGIST of the lesser omentum that represented a diagnostic challenge. Due to its atypical radiologic findings, it was preoperatively mistaken for pedunculated hepatic hemangioma. Histopathologically, it showed epithelioid structure and c-kit negative, very uncommon for GIST. Only a few cases of EGISTs have been previously reported. We discuss imaging and histological features, emphasizing potential pitfalls.
Radiodiagnostic and Radiotherapy Unit, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy. Electronic address: claudiatr84@libero.it.
Claudia
C
Trombatore
Radiodiagnostic and Radiotherapy Unit, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy. Electronic address: spalmucci@sirm.org.
Stefano
S
Palmucci
G. F. Ingrassia Department, Section of Anatomic Pathology, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy. Electronic address: giuangel86@hotmail.it.
Giuseppe
G
Angelico
G. F. Ingrassia Department, Section of Anatomic Pathology, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy. Electronic address: vasquez@unict.it.
Enrico
E
Vasquez
Radiodiagnostic and Radiotherapy Unit, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy. Electronic address: pucciopetrillo@hotmail.com.
Giuseppe
G
Petrillo
Department of Surgical Sciences, Organ Transplantation and Advanced Technologies, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy. Electronic address: spuleo@unict.it.
Stefano
S
Puleo
Department of Surgical Sciences, Organ Transplantation and Advanced Technologies, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy. Electronic address: dicataldoa@tiscali.it.
Antonio
A
Di Cataldo
D000368:Aged; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D006801:Humans; D008099:Liver / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology*; D009852:Omentum / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology*; D010534:Peritoneal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D019009:Proto-Oncogene Proteins c-kit / Q000378:metabolism*; D011859:Radiography
D019009:Proto-Oncogene Proteins c-kit
CT; GIST; MRI; Primitive omental tumor