A 6-year-old presents with recurrent fever, right upper quad…

A 6-year-old presents with recurrent fever, right upper quadrant pain, and jaundice.  An abdominal sonogram is performed.  The liver and gallbladder appear normal, but a 2 cm cyst is seen communication with the common bile duct.  What is the most likely diagnosis?

You are performing a contrast enhanced ultrasound of a liver…

You are performing a contrast enhanced ultrasound of a liver lesion.  During the procedure the mass became brightly echogenic compared to the surrounding liver tissue in the arterial and portal venous phases. On delayed imaging the lesion was hypoechoic compared to the surrounding liver tissue.  What is the most likely diagnosis?