Purpose: Echinococciasis or hydatid disease is a cosmopolite anthropozoonosis common to many mammalian species including humans. The disease is caused by development of the larval form of a canine tenia called Echinococcus granulosus. Muscle localisations are rare.

Material and methods: We report eleven cases of hydatic disease of muscle, generally with a unique primary hydatid. The proximal muscles of the lower limbs were predominantly involved. Diagnosis was suggested in patients with a soft tissue tumour in an endemic context. Ultrasonography was highly contributive to diagnosis. Surgical treatment was given in all cases, ideally by prudent enucleation of the cyst associated with pericystecomy in four patients.

Results: Early outcome was favourable with the exception of a suppuration of the resection zone in one patient. At mid term, there has been one secondary muscle localisation far from the initial site. At 2.5 years follow-up, there have been no cases of local or distant recurrence.

Discussion: It is important to establish the diagnosis of hydatid disease of muscle before surgery in order to limit the risk of anaphylactic shock and dissemination in the event of accidental puncture. Exclusively surgical treatment is indicated.

Conclusion: Hydatid disease of the muscle is a rare event. Diagnosis is basically provided by ultrasonography, avoiding the risk of puncture. Exclusive surgical treatment removes the cyst without puncture.