Hepatic echinococcal cysts: sonographic appearance and classification.

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Abstract
The sonographic appearance of echinococcal lesions of the liver was studied in 59 patients. A classification of these lesions was proposed that reflects the pathology and natural history of the disease: type I, simple fluid-filled cysts; type IR, lesions containing undulated membranes that represent detached endocyst secondary to rupture; type II, lesions that contain daughter cysts and/or a formed echogenic material called matrix; and type III, dead, densely calcified lesions. The natural progression of hepatic echinococcal cysts is from type I and III. Daughter cyst formation is part of the natural aging process. When hydatid cysts are infected, they lose their characteristic sonographic appearance and become diffusely hyperechoic.

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