Adenosquamous Carcinoma of the Pancreas That Had Penetrated
Adenosquamous carcinoma is characterized by the histological presence of both adenocarcinoma and squamous cell carcinoma (SCC) within the same tumor. Compared with adenocarcinoma, adenosquamous carcinoma has a lower incidence and poorer prognosis. A histological analysis reported that pancreatic adenosquamous carcinoma (PASC) comprises only 0.09-0.4% of all cancers that occurs in the pancreas [1, 2]. PASC is diagnosed based on the criteria that more than 30% of squamous components are included in the pancreas tumor tissues [3]. The biological nature of PASC is its aggressive proliferation and invasiveness into other tissues, including the lymph nodes, vessels, and nerve plexuses. Here we report the case of a patient with PASC that had penetrated into the stomach and transverse colon.

Case Report
A 55-year-old male with no relevant medical history presented with complaints of left flank pain, general fatigue, a sense of listlessness, and melena. His mother and aunt had died of colorectal cancer, and his father had died of lung cancer. He had been experiencing a dull pain in the left flank for 2 months prior to his presentation to the hospital. Upon presentation, severe anemia was evident based on his palpebral conjunctiva. There was tenderness over the upper abdomen and a palpable mass on his left upper abdomen....