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ABSTRACT Fibrodysplasia ossificans progressiva (FOP) is a rare autosomal dominant hereditary disorder affecting around one in two million people. It is characterized by heterotopic calcification in muscles, tendons, ligaments, membranes and aponeurosis. It is the only known disorder in which one kind of tissue is converted into another. There is no gender, ethnic or geographical preference. We describe the case report of fibrodysplasia ossificans progressiva in 28 years old female with primary amenorrhoea, first of its kind from Pakistan.     Key words: Fibrodysplasia ossiificans progressive, heterotopic ossification, primary amenorrhoea, sclerosis, corticosteroids.