The cyst stage of Echinococcus granulosus is commonly located in the l
iver, which frequently results in a long symptomless period. We presen
t a sudden death due to a freshly hemorrhagic hydatid cyst following b
lunt trauma to the liver in a 19-year-old boy. The possible mechanism
was thought to be an anaphylactoid reaction to the leakage of the cyst
fluid.