[Hydatidosis: apropos of several uncommon locations]

Most hydatid cysts are found in the liver or lungs but occurrence in other locations is possible. The purpose of this report is to describe three cases involving cysts locate in the ovary, joint, and thyroid. Clinical findings associated with these uncommon locations were poorly specific and diagnosis required histological examination after surgical exploration. Imaging and serology were useful to differentiate hydatid cyst from benign or malignant tumor disease but often failed to achieve definitive differential diagnosis. Thorough investigation is necessary to rule out more common locations in the liver or lung. Continued surveillance is needed for early detection of recurrence. Preventive campaigns are necessary in endemic areas, such as Morocco.