An 82-year-old woman presented to the emergency department with 2 months of diarrhea and 2 weeks of rash. She had sustained a left radius fracture 6 months prior, which resulted in deconditioning and poor appetite. Her diet consisted of mostly vegetables, and she lost 4 kg (8.8 lb) during this time. Two months prior, she developed postprandial nonbloody diarrhea that occurred 5 times daily. Two weeks prior, a pruritic rash in her extremities emerged. She had no fever, night sweats, or abdominal pain. Past medical history included chronic nondeforming rheumatoid arthritis, hypothyroidism, and colon adenocarcinoma resected 10 years prior. Her medications were prednisolone (1 mg/d) and levothyroxine.