Case Presentation: A 64-year-old female with hereditary transthyretin amyloidosis (hATTR) and hypothyroidism presented with three days of dull pain localized bilaterally to the biceps femorum, recurrent emesis, and anorexia. Her past medical history includes complications of hATTR (being treated with patisirtan and tafamidis); polyneuropathy, small bowel enteropathy, and cardiomyopathy with associated recent bioprosthetic mitral and [...]