Collision of advanced gastric adenocarcinoma and gastrointestinal stromal tumour: a case report.

We present a case of an 83-year-old female patient with a collision tumour of an advanced Borrmann type 4 gastric cancer and a large gastric gastrointestinal stromal tumour (GIST). According to the deformity of the gastric wall caused by the GIST, type 4 cancer was difficult to identify by oesophagogastroduodenoscopy (OGD). The patient died of progressive gastric cancer related disease.