Atypical McLeod syndrome manifested as X-linked chorea-acanthocytosis, neuromyopathy and dilated cardiomyopathy: report of a family.

We report a family with three members affected by a typically X-linked McLeod syndrome. In the proband a very weak positivity for antigens of the Kell group was detected. His sister showed a normal antigenic pattern. We emphasize the prominent neurological picture characterized by a choreic syndrome with atrophy of the caudate nucleus on MRI, psychiatric disturbances, peripheral nerve and muscle biopsy findings indicating slight neuromuscular involvement, and cardiac abnormalities. The differential diagnosis is discussed.