Concomitant Lymphocytic Colitis With Recurrent Clostridium difficile Infection.

Microscopic colitis is a clinicopathological diagnosis that is characterized by chronic microscopic inflammation of the colon and presents with chronic watery diarrhea. There are following two subtypes of microscopic colitis: lymphocytic colitis and collagenous colitis. This is a case of a 70-year-old female with a history of infections who presented with persistent watery diarrhea and was diagnosed with lymphocytic colitis in the setting of a concomitant infection. Given her clinical presentation, the patient was initiated on empiric treatment for infection and showed a lack of clinical improvement with persistent watery diarrhea and elevated white blood cell count. The patient's symptoms resolved upon the confirmatory diagnosis and treatment of lymphocytic colitis. This study illustrates the importance of assessing for, diagnosing, and treating lymphocytic colitis in patients with chronic non-resolving watery diarrhea, especially in the setting of concomitant or recurrent infections. Additionally, it emphasizes the need for further characterization of the relationship between infection and microscopic colitis.