A patient with mononeuropathy multiplex, sensory neuronopathy, and dif
fuse intestinal pseudo-obstruction consisting of gastroparesis and imp
aired small and large bowel motility was found to have a small cell ca
rcinoma of the lung. The constellation of findings were indicative of
paraneoplastic neuropathy, which was confirmed with the appropriate an
tibody studies demonstrating antineuronal nuclear antibodies. Identifi
cation of paraneoplastic neuropathy is important, since early treatmen
t of the primary cancer, which is virtually always a small cell carcin
oma of the lung, may halt the progression of the disorder. (C) 1994 Jo
hn Wiley and Sons, Inc.