Muscular hydatid cyst is a rare entity and usually associated with cysts in liver or lung. We present an unusual case of a primary hydatid cyst found in the right arm brachioradialis muscle of a 40-year-old man, presenting as an tender mass after blunt trauma. Magnetic resonance imaging examination revealed an intramuscular hematoma in the distal of her right arm, and no disease at any other location. The mass was excised radically. Macroscopic and microscopic histopathological examinations confirmed the diagnosis of muscular hydatidosis.
 

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