myofibrillar myopathy 7 (MONDO_0014922) is any myofibrillar myopathy in which the cause of the disease is a mutation in the KY gene. Also known as: KY myofibrillar myopathy (disease), alpha-b crystalin-related fatal infantile hypertonic myofibrillar myopathy, myofibrillar myopathy (disease) caused by mutation in KY, myopathy, myofibrillar, 7, myopathy, myofibrillar, type 7.