Primary Sacral Hydatid Cyst Causing Cutaneous Fistula.

Echinococcus granulosus and Echinococcus multilocularis are the causes of hydatid disease and the main characteristic is endemic. Generally, it affects the liver and lungs. Spinal hydatidosis accounts for less than 1% of the cases. Vertebral hydatidosis is usually silent and a slowly progressive disease with a long latent period. Another rare form is the primary sacral hydatid cyst. Generally, patients suffer from back pain and neural compression symptoms. A 43-year woman was admitted with left leg pain and a fluid leakage from a cutaneous fistula on the left hip. It was diagnosed on MRI as a bilateral cystic lesion which eroded the first sacral wing, extending to the paravertebral region and left intervertebral for a men. We present a case with fluid leakage from cutaneous fistula.