[Nonspecific symptoms due to gastrointestinal stromal tumors].

Three patients, two women aged 64 and 52 years and one man aged 78 years, had non-specific symptoms and they had signs of a tumour at imaging examination. Immunohistochemical study of operation preparations led to the diagnosis of 'gastrointestinal stromal tumour' (GIST). It is important to consider the possibility of a GIST at surgery, because the potential malignancy requires a resection with free margins.