Unusually large resecable intraabdominal gastrointestinal stromal tumour negative for CD117

Gastrointestinal stromal tumours (GISTs) are currently defined as mesenchymal tumours of the gastrointestinal tract that express KIT receptor tyrosine kinase. However, a small subgroup of tumours that fulfill the clinical and morphological criteria for GISTs lack KIT expression. In our case, the 67 year old patient reported with a slowly growing palpable intraabdominal mass, causing constant pain and subileus. Abdominal CT scan showed a large tumour of extraintestinal origin without hepatic metastases. Fine needle aspiration (FNA) cytology was not performed because of the interpositioned bowel between the mass a…