Widespread Hydatidosis of Sacroiliac Bones and Retroperitoneum: A Case Report

Hydatid disease is one of the oldest diseases known to humankind. In 85-95% of the cases, the liver and/or the lungs are involved and only 5-15% of other organs. The case presented here is a 38-year-old man with hydatid disease of lower lumbar vertebrae, sacrum, lumbosacral spinal canal, and left iliac bone; with extension to retroperitoneum and piriformis, sacrospi-nalis, iliacus, iliopsoas, and quadratus lumbarum muscles; without involvement of liver or lung, as diagnosed by MRI and CT scan and confirmed by surgery.