Synchronous or metachronous gastric tumors composed of adenocarcinoma and gastrointestinal stromal tumor (GIST) are very rare and have seldom been reported in the literature. We present a case of an elderly man with synchronous gastric adenocarcinoma and GIST of the stomach. The adenocarcinoma presented as an ulcerated transmural tumor measuring 12 x 11 x 2 cm protruding from the lumen, occurring synchronously or metachronously with a 0.7 cm sized intramural nodular lesion, 1.5 cm proximal to the distal border of the resection, and was diagnosed as a gastrointestinal stromal tumor. The increasing tendency for gastric tumours to be synchronous or metachronous may be due to the change in biological behavior of tumors or causal environmental factors. Whether this association has any effect on survival is yet unknown. The important thing however, is to completely resect the lesions, as in single gastric carcinoma cases.
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机译：由腺癌和胃肠道间质瘤（GIST）组成的同步或异时胃瘤非常罕见，文献中很少报道。我们提出了一例患有同步性胃腺癌和胃GIST的老人。腺癌表现为溃疡性透壁肿瘤，从管腔突出，尺寸为12 x 11 x 2 cm，与0.7 cm大小的壁内结节性病变同步发生或异时发生，距切除术的远端边界近1.5 cm，并被诊断为胃肠道基质肿瘤。胃肿瘤发生同步性或异时性的趋势可能是由于肿瘤生物学行为的改变或因果环境因素引起的。这种关联是否对生存有任何影响尚不清楚。然而，重要的是要完全切除病变，如在单个胃癌病例中一样。
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