[Synchronous gastrointestinal stromal tumor of stomach and invasive ductal carcinoma of both breasts]. / Synchroniczne wystepowanie nowotworu podscieliska przewodu pokarmowego w zoladku oraz raka przewodowego inwazyjnego obu gruczolów piersiowych.

Gastrointestinal stromal tumor (GIST), despite the fact that it accounts for less than 5% of all sarcomas, is the most common mesenchymal tumor of the alimentary canal. Synchronous and metachronous stromal tumors are very rare findings. Only a few such cases can be found in the literature, and yet most of them is connected with Von Recklinghausen's disease or Carney's triad in which it is proved a much higher frequency of occurrence of this kind of tumors. CASE REPORT: We present a case of 64 years old women, who was diagnosed with invasive ductal carcinoma of both breast due to screening mammography. Patent was qualified to bilateral mastectomy. Perioperative computer tomography scan revealed an additional pathological abnormality situated beyond stomach light, which after resection and immunohistochemistry was found to be a gastrointestinal stromal tumor. This case emphasize the problem of synchronous stromal tumors, the detection of which is often difficult due to nonspecific symptoms. Despite the fact that the most common localization of coexisting tumors is the digestive tract, one should remember about the possibility of occurrence in less frequent locations such as the breast.