Wang, Xiao Jing (Iris)

ABSTRACT Lymphocytic colitis (LC) is a subtype of microscopic colitis, often associated with chronic watery diarrhea and characterized by an increase in intraepithelial lymphocytes. Although various medications are implicated in drug-induced LC, its incidence as a treatment-related adverse effect of rearrangement during transfection-selective tyrosine kinase inhibitors is not known. We report a case of pralsetinib-induced LC in a patient with stage 3c nonsmall cell lung cancer. This case highlights pralsetinib-induced LC as a cause of persistent diarrhea that is refractory to standard antidiarrheal treatments and prompts gastrointestinal evaluation and histopathological examination to facilitate early diagnosis and management.

ABSTRACT Levator ani syndrome (LAS) explains up to 7.4% of anorectal pain cases. Classic symptoms include rectal pain or pressure with sitting. We present 2 patients, ages 32 and 25 years, presenting initially with “diarrhea” and perianal hyperhidrosis. History revealed rectal discomfort, tenesmus, urgency, and sensation of incomplete evacuation. Puborectalis tenderness was present on digital rectal examination. Therapies were tailored to each patient, including pelvic floor physical therapy with biofeedback, bowel regulation, rectal diazepam, and ileostomy. These presentations offer insights into potential pathophysiological mechanisms in LAS and highlight the importance of considering LAS in non-pain presentations.