[Cranial computerized tomography in incomplete Lesch-Nyhan syndrome].

The CT brain scan of a 17-year-old patient with primary hyperuricaemia and mental retardation is presented. The examination demonstrates subcortical and cortical atrophy of the brain. The HGPRTase level was below normal. Clinical evidence of self-mutilation or tophi was not found. This patient's condition was interpreted as an incomplete Lesch-Nyhan syndrome.