A case of amyloidosis presented with neuromyotonia and marked predomin
ance of type I myofibers as documented by biopsy of an enlarged anteri
or tibialis muscle. This likely represents conversion of type II fiber
s to type from continuous neuromyotonic stimulation. This transformati
on is well described to occur in animal models and this case represent
s a unique human example. Enlarged muscles likely reflected pseudohype
rtrophy. (C) 1996 John Wiley & Sons, Inc.