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Primary Intramuscular Infestation of Echinococcus granulosusMisdiagnosed as a Soft Tissue Tumor

BACKGROUND
The occurrence of a primary intramuscular infestation of Echinococcus granulosus is extremely rare.


CASE
A 70-year-old woman with primary skeletal muscle hydatidosis initially presented with a soft tissue mass. Clinical and radiologic examination revealed a huge cystic mass in the right quadriceps muscle without any visceral organ involvement. Since the differential diagnosis included a soft tissue tumor, fine needle aspiration cytology was performed, and a diagnosis of hydatid disease was made.


CONCLUSION
This very rare case of primary intramuscular infestation of E granulosus was clinically misdiagnosed as a soft tissue tumor. Hydatid disease, albeit rare, should be considered in the differential diagnosis of a soft tissue mass.