[A case of metastatic prostate cancer with gastric metastases and high serum CEA].

A 74-year-old male who was receiving endocrine therapy for prostate cancer, with multiple bone and lymph node metastases (T2bN1M1 Stage D2), underwent follow-up computed tomography (CT). The CT revealed multiple liver metastases, a high serum CEA level, and an unchanged PSA level. Upper gastrointestinal endoscopy showed an elevated lesion with mucosal erosion on the lesser curvature of the middle gastric corpus, revealed to be a metastatic prostate cancer lesion following immunohistochemical confirmation. This case demonstrates the potential for gastric metastases in patients with advanced prostate cancer and high serum CEA levels.