Rare Presentation of Primary Classical Hodgkin Lymphoma of a Rectosigmoid Colon in a 79-Year-Old With a History of Irritable Bowel Syndrome.

We discuss the case of a 79-year-old immunocompetent male who presented with weight loss and diarrhea and ultimately was found to have a rectosigmoid mass on a colonoscopy. Even though initial biopsies obtained during colonoscopy were non-diagnostic, considering the likelihood of malignancy, lower anterior resection was performed, and pathology confirmed the diagnosis of primary Hodgkin's lymphoma of the sigmoid colon. Hodgkin's lymphoma typically presents as painless supra-diaphragmatic lymphadenopathy with B symptoms such as fever, unexplained weight loss, and drenching night sweats. Due to the rarity of primary Hodgkin lymphoma in the colon and its non-specific initial presentation, we believe sharing this case will bring awareness to the atypical presentation of Hodgkin lymphomas.