Primary isolated hydatid cyst in pectoralis muscle

Hydatid disease is a cosmopolitan anthropozoonosiss, common to both humans and mammals, is caused by infection with the larval stage of Echinococcus granulosus. It occurs worldwide and is especially common in endemic countries. Hydatid cysts are most commonly found in the liver and lungs. Primary hydatid cysts are rarely detected in muscle tissue, even in endemic countries, it represents less than 1% of all locations of cystic echinococcosis. Clinical signs are often non-specific early on and there are no pathognomonic radiologic features, thus making it difficult to diagnose. Hydatid disease is still considered a major public health issue and must be suspected in front of any cystic musclar mass. We report an unusual case of isolated hydatid cyst in pectoralis muscle without pulmonary or pleural involvement, in a 14-year-old patient, whose pre-operative imagery suggested a cystic lymphangioma and the diagnosis of musclar hydatid cyst was made intra-operatively and confirmed by an anatomopathological examination.