Aggressive hydatid disease of the foot and ankle.

An extremely rare case of aggressive hydatid disease of bone is described in a 29-year-old male. Although the disease was limited to the talus at initial presentation, it spread through the entire foot and ankle after surgical treatment. The unusual aggressive nature of the recurrence was attributed to the spread of infestation during the first surgery. Amputation of the foot and ankle was performed due to the invasive nature of the bone and soft tissue involvement.