Hyperostotic and destructive osteoarthritis in a patient with vitamin A intoxication syndrome: a case report.

The authors present a case report of a 59-year-old female suffering from hyperlipidemia who developed chronic vitamin A intoxication syndrome after ingestion of 30,000 IU retinol/daily over a period of six years. The patient's main complaints included severe headaches, morning nausea, myalgias and disability around the hip, knee, and ankle joints. Radiologically, hyperostosis of the acetabular circumference and the spine was demonstrated. Because of rapidly increasing pain, total hip replacement was performed. Histology of cross sections from the femoral head revealed destructive osteoarthritis. Since no other causative reason was found, retinol may not only be responsible for hyperostotic bone and soft tissue formations but may perhaps also account for rapid progressing of degenerative joint disease. Despite the cessation of vitamin A intake the clinical symptoms persisted due to hyperlipidemia. The enlarged number of chylomicrons and the higher fraction of very low density lipoproteins may represent a second retinyl ester pool in case of overloaded fat storing Ito-cells in the liver. Therefore, rheumatological treatment reducing risk factors such as hyperlipidemia is mandatory.