[Partial algodystrophy].

Two patients are described with parcellar algodystrophy, a special form of algodystrophy. Bone biopsy in one patient revealed increased bone resorption and irregular new bone formation. Parcellar algodystrophy is characterized by the very localized pathological changes in the region of a joint. Only a small area of demineralization may be visible on X-ray. Skeletal scintigraphy shows hyperfixation of technetium-99m already in an early stage. Although the inflammatory signs are clinically impressive, the ESR may be normal. History may reveal previous involved joints. Parcellar algodystrophy normally runs a benign course. The difficulty of correct diagnosis is discussed. The changes are compared to those of partial algodystrophy and algodystrophy with no radiological abnormality throughout the course of the disease.