Limb-girdle muscular dystrophy 2B

Limb-girdle muscular dystrophy type 2B (LGMD2B) is an autosomal recessive phenotype of dysferlinopathies, muscle disorders caused by mutations in the dysferlin gene (DYSF). Clinically, it is characterized by weakness in the proximal muscles at onset, involving predominantly the lower limbs. At late stages of the disease, loss of muscle bulk in the pelvic girdle and calf may appear. Onset is typically in the late teens or early adulthood.