Case Presentation: A 76-year-old man with mantle cell lymphoma status post chemotherapy 1 week prior presented to an outside emergency department with generalized weakness. Initial laboratory workup revealed hemoglobin of 8.8 g/dL, platelet count of 3 × 109/L, creatinine 5.55 mg/dL and bicarbonate 7 mmol/L (Table 1). Rectal exam showed brown stool, however fecal occult […]