Acidophilic adenoma of the pituitary with polyneuropathy

An acromegalic man aged 70 developed progressive polyneuropathy affecting mainly the extremities. The peripheral nerves showed hypertrophic neuropathy and accumulation of acid mucopolysaccharides in the nerve without `onion bulb' formation. The myelin showed a lamellar disintegration and vesicular formation. It is suggested that the association of these findings represents a pathological entity, acromegalic polyneuropathy.