RESUMEN
The synchronous diagnosis of two or more primary malignancies in a patient is overall rare. This is a case report of a 70-year-old female with a history of skin squamous cell carcinoma presenting with occult hematochezia. Colonoscopy and biopsy results confirmed a microsatellite stable (MMS) adenocarcinoma in the ascending colon, and subsequent computed tomography (CT) scans identified a 3.2 cm right colonic mass and a 5.0 cm mass in the pancreatic body. Endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) confirmed the presence of pancreatic ductal adenocarcinoma (PDAC). The patient underwent neo-adjuvant FOLFIRINOX (folinic acid, fluorouracil, irinotecan and oxaliplatin) chemotherapy prior to the simultaneous distal pancreatectomy and right hemicolectomy for both pancreatic and colonic tumors. The pathology diagnoses included moderately differentiated pancreatic ductal carcinoma (PDAC) with histiocyte-like features (tumor stage: ypT3N1M0) and moderately differentiated colonic adenocarcinoma, intestinal type (tumor stage: ypT3N0M0). To the best of our knowledge, this is the first documented case of synchronous primary colonic adenocarcinoma and PDAC in the English literature.