Progressive brachial diplegia unmasking flail arm syndrome, a regional variant of amyotrophic lateral sclerosis: a case report
Background: Flail arm syndrome (FAS) is an uncommon variant of amyotrophic lateral sclerosis (ALS) characterized by progressive, predominantly lower motor neuron weakness confined mainly to the upper limbs. Because structural cervical disease is common in older adults, its diagnosis may be delayed or misattributed to c...