<prompt> Solitary hypoechoic lesion of the liver without septa or debris is most likely to be -Hydatid cystCarolis diseaseLiver abscessSimple cyst  <response>: A solitary hypoechoic lesion without any septae or debris is most likely to be a simple cyst. However rarely a hydatid cyst can have a similar sonologic appearance.Simple cysts are the most common benign lesions found in liver. On imaging studies they appear as unilocular, homogenous fluid-filled structures with a thin wall without projections, septa or debris.Ultrasound appearances of -Hydatid cyst -It presents either as a simple cyst with hydatid sand or daughter cysts or floating endocyst or calcification.Carolis disease -Its the type V choledochal cystMultiple intrahepatic biliary cysts are seen on ultrasound. Sludge stones may also be visible within the cysts.Liver abscess -Sonographic appearance may include a cystic lesion with floating internal echoes and irregular margins.Septations, debris and fluid-fluid interfaces may also be seen. 