Primary pancreatic lymphoma: Report of 4 cases with literature review.

Pancreatic cancer (PC) is ranked as the 14th most common cancer and the 7th leading cause of cancer-related deaths. The most common histological type is adenocarcinoma, other type such as primary pancreatic lymphoma (PPL) still very rare. Due to the lack of specific clinical and imaging characteristics, the diagnostic of PPL remains challenging. We report 4 cases of PPL diagnosed and managed at our gastroenterology department between 2019 and 2023. Case 1: A 16-year-old male presented with abdominal pain, jaundice, and weight loss. Imaging revealed an 8 cm tumor in the pancreas, subsequent biopsies confirming Burkitt's lymphoma. Despite chemotherapy, the patient succumbed to the disease. Case 2: A 92-year-old female with no prior medical history presented with abdominal pain, jaundice, pruritus, and weight loss. Imaging revealed a large pancreatic mass, and biopsies identified large B-cell lymphoma. Unfortunately, the patient passed away before treatment initiation. Case 3: A 63-year-old male with a history of tobacco smoking presented with abdominal pain, weight loss, and anorexia. Imaging and biopsies confirmed diffuse large cell B-phenotype lymphoma. The patient achieved complete remission after rituximab, cyclophosphamide, doxorubicin hydrochloride, vincristine, and prednisone (R-CHOP) therapy. Case 4: A 67-year-old man with jaundice, abdominal pain, and weight loss was diagnosed with diffuse large cell B lymphoma through imaging and fine needle aspiration (FNA). The patient responded well to R-CHOP therapy. In conclusion, PPL is an uncommon tumor, with no specific clinical or radiological characteristics. A thorough evaluation of clinical, radiological, biological and histological data is necessary to consider it as a differential diagnosis and ensure accurate and timely management.