We report a case of myasthenia gravis in a young Melanesian woman. It
is only the second case described from Papua New Guinea and the first
in which antibodies to the acetylcholine receptor have been demonstrat
ed. The patient's complaint of occasional dysarthria was initially dis
missed as hysterical in nature due to her apparent normal speech on co
nversation. The true nature of her problem only became apparent when s
he was asked to read a prolonged monologue. Myasthenia gravis may pres
ent without involvement of the eye muscles and the diagnosis may only
become apparent if muscle groups are specifically tested for fatiguabi
lity.