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Two sisters, products of a consanguineous marriage (with a total of 12 children) showed muscle weakness at ages 7 and 6 yrs, respectively. The symptoms progressed rapidly and the patients were confined to wheelchairs at ages of 12 and 11 yrs, respectively. They had mild facial weakness and pseudohypertrophy of the calves, but neither cardiomyopathy nor mental retardation. Serum CK activities exceeded upper normal limit by 70 to 85-fold. Muscle biopsies were compatible with muscular dystrophy. Both girls had a normal karyotype. The healthy mother had mild CK elevations in two out of three occasions, but the muscle biopsy was normal. Three out of the six unaffected sibs had mild CK elevations. The findings support the concept of severe progressive muscular dystrophy with autosomal recessive inheritance. The condition is clinically indistinguishable from Duchenne muscular dystrophy.
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