Miopatía centro nuclear tardía: forma autosómica dominante / Later centronuclear myopathy: autosomal dominant form

We report a family with three generation affected by an autosomal dominant centronuclear palsy. This gene is characterized by ptosis that begins in childhood and a slowly progressive weakness that starts in the second decade of life, involving face, neck and limbs. In this stage, muscle pan associated to exercise or cold muscle sparms may apprear. The gene is expressed with differing intensity in each individual. Myopathic electro myographic alterations are only found in fuctionally impaired subjects. Muscle biopsy shows type I fiber atrophy and central nuclei in a high percentage of fibers, specially in type I fibers

Miopatía del cuadriceps: una forma de distrofia focal tardía en un caso / Quadriceps myopathy: a from of late focal dystrophy

A 62 years old male with a slowly progressive focal myopathy is presented. He had noticed weakness in the lower limbs of 3 years and weakness in the upper limbs for 1 year. He had bilateral atrophy of quadriceps and biceps muscles, absence of knee jerks and hypertrophy of the calves. Needle EMG showed myopathic motor units. Hystological study was compatible with muscular distrophy. The clinical and laboratory characteristics of the patient are in keeping with what has been described as quadriceps myopathy as a form of a muscular dystrophy