Spontaneous Distal Biceps Tendon Rupture as a Rare Finding of Systemic Amyloidosis and Heart Failure with Preserved Ejection Fraction

A 61-year-old man with a history of hospitalization for acute decompensated heart failure and pulmonary edema was admitted to the intensive cardiac care unit with fatigue, shortness of breath, and bilateral leg edema. Upper extremity musculoskeletal examination shows bunching of the biceps when the patient flexed his arm.