Spontaneous rupture of Hydatid cyst of thigh-A very rare presentation

Hydatid disease is quite common in countries like India, Egypt, Australia, New zealand, Mediterranean countries, Middle East, Africa and sheep rearing countries (Kayaalp et al., 2007). This common disease is known to affect many uncommon sites in the human body as face, mediastinum, retroperitoneum, breast, thyroid and intermuscular planes. Other unusual sites include heart (2%), kidney (1.5%-3%), brain (3%), and spleen (3%). Incidence of musculoskeletal disease including subcutaneous tissue has been reported to be 0.5 to 5 % (Gole et al., 2013). Hydatid cysts at multiple unusual sites have also been reported (Abbey et al., 2002). These unusual sites, where suspicion of hydatid disease is unlikely, present as diagnostic dilemma. Incidence of hydatid disease of thigh has been reported to be 0.37% In a series of 272 cases of hydatid disease and thigh is the commonly involved unusual site (Gole et al., 2013). This could be explained due to high vascularity and less muscular activity at this site (Gracia-Diez et al., 2000) These unusual sites may present as diagnostic dilemma as suspicion of hydatid disease at these unusual sites is unlikely. Spontaneous rupture of hydatid cyst of these externally visible sites need no specific investigations when the diagnosis is more than evident on clinical examination as in the case being presented here.