Sparganosis is human infestation by a larval form of an animal tapeworm, genus Spirometra. Human infestation is considered to be acquired by ingestion of water snakes, frogs, or drinking water contaminated with the larval stage of the tapeworm.'The frequent locations of infection in humans are subcutaneous tissue or skeletal muscle of the lower extremity, abdominal wall, abdominal viscera, chest, breast, scrotum, and brain.' The mammographic and sonographic findings in a case of breast sparganosis were reviewed. Sonographic feature in the breast was correlated with the sonography of the operatively extracted living worms from the breast and pathologic data. Mammography showed multiple, lobular, marginated, amorphic, solid masses without calcification. Sonography showed elongated, folded band-like hypoechoic structures in a heterogenous hyperechoic mass, which was proved to be the empty tunnel and the living worm with surrounding granuloma on pathologic examination. Hypoechoic band-like tracts in the mass suggested that tunnel where a worm had migrated because the extracted worm itself in saline solution appeared as a hyperechoic structure with sonography. This hypoechoic tunnel in the heterogenous hyperechoic mass is thought to be a reliable sonographic finding of breast sparganosis. CASE REPORTA 76-year-old woman was referred with a nontender, softly palpable mass in the right upper quadrant of the breast that had been present for 3

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