James A. Madura, II, MD

Hydatid disease of the liver is endemic in some areas of the world but is rarely encountered in the United States. The disease is usually caused by the parasite Echinococcus granulosus. Physicians who work within multicultural communities must be aware of this disease and its treatment. We present the case of a 35-year-old Mexican woman who complained of chronic right upper-quadrant pain. Computed tomography scanning revealed a ring-enhancing lesion within the right lobe of the liver, suggesting the diagnosis of a hydatid cyst. Following a course of antiparasitic therapy, the cyst was surgically removed. Six months later, the patient was pain free.