Chorea as an initial manifestation of systemic lupus erythematosus. A case report of a 10-year-old girl.

Neurological complications of systemic lupus erythematosus (SLE) are relatively common, but isolated chorea as the initial manifestation of SLE is very rare. We report a 10-year-old girl presenting with chorea, who developed clinical and laboratory findings of SLE 10 months after the onset of chorea. In this case, mild depression of complement levels in serum, which had already been found in the early stage of the chorea, was the only abnormal laboratory datum. The low serum complement levels that precede the appearance of other clinical and laboratory findings may be helpful for the diagnosis of isolated chorea involvement in SLE.