In cases where echinococcus is suspected, what finding might you see on ultrasound?

• A. Multiple cysts in the liver
• B. Single large abscess
• C. Enlarged spleen
• D. Fluid collection in the peritoneal cavity

Answer: (A)

In cases of echinococcal infection, commonly caused by the Echinococcus granulosus parasite, ultrasound imaging reveals multiple cysts primarily in the liver, which is the most affected organ. These cysts represent hydatid cysts that form as the larval stage of the parasite develops. These lesions can vary in size and may appear as anechoic or hypoechoic areas on the ultrasound, sometimes containing internal structures or membranes.

The presence of multiple cysts is significant because it indicates not only the infection but also suggests the chronicity of the condition. Additionally, the appearance of the cysts may lead to differential diagnosis considerations with other forms of liver disease, such as abscesses or tumors.

Other findings, such as a single large abscess, enlarged spleen, or fluid collection in the peritoneal cavity, are not characteristic of echinococcal infection. A single abscess would more likely suggest a bacterial infection, an enlarged spleen may indicate other systemic diseases or infections, and a general fluid collection could be due to various causes not specific to echinococcus.