Abstract
The most common metastasis sites of malignant stromal tumors are the liver, peritoneum, lung, and bones. Metastasis to the breast is extremely rare. Therefore, this is a very rare combination. Both being primary concomitantly is a further rare combination. Gastrointestinal stromal tumors (GISTs) and other primary carcinomas in the same patient are not unusual, and they are frequently discovered by chance. GISTs are uncommon mesenchymal tumors of the gastrointestinal (GI) system. There is a scarcity of information on the prevalence of mesenchymal tumors and other primary tumors in the literature. Therefore, more studies are required to establish the same. Concomitant GISTs accompany the most prevalent epithelial malignancies of the gastrointestinal system. More research is needed to shed insight into the molecular and genetic pathways of GIST and synchronous tumor oncogenesis and progression. This case report brings to light a synchronous double tumor of the breast and gastrointestinal stroma.