Cardiomyopathy is seen in all except -

signs and symptoms of Alkaptonuria:valvular hea diseases mainly calcification regurgitation of the aoic and mitral valves, may occur, and in severe and progressive cases, valve replacement may be necessary. Irregularities in the hea rhythm and hea failure affect a significant propoion of people with alkaptonuria (40% and 10%, respectively). Hearing loss affects 40% of people. Also, a propensity to developing kidney stones exists, and eventually also gallstones and stones in the prostate and salivary glands (sialolithiasis) can occur. Ref Harrison 20th edition pg 1578