Echinococcos granulosus (unilocular or cystic hydatid disease) and the more
malignant E. multilocularis (alveolar hydatid disease) is the causative agent.
Children often present as mass in the right upper quadrant as hepatomegaly and
pain or respiratory symptoms as chest pain, coughing, or hemoptysis. Ultrasound
(floating echogenic cyst material (hydatid sand)) or CT Scan shows cyst with
thick margins. The primary treatment is the surgical removal of the cyst.