Infrequent presentations of reflex sympathetic dystrophy and pseudodystrophy.

Pseudodystrophy is a condition that in the past was regarded incorrectly as a kind of reflex sympathetic dystrophy. The difference between both diseases can be ascertained easily by a bone scintigraphy. Other clinical features of pseudodystrophy are discussed. Infrequent presentations of reflex sympathetic dystrophy are described: radial, parcellar, and zonal cases; vertebral localization; and other misleading conditions.