What is the arrow labeled #1 pointing to? 

Which structure is identified by the letter “F” in this image?  

A neonatal ultrasound reveals a unilateral mass composed of multiple non-communicating cysts of varying sizes with no identifiable renal sinus or normal parenchyma within the right renal fossa. The contralateral kidney is enlarged but normal. What is the likely diagnosis?

Asher’s sign states that splenomegaly is suspected when the spleen extends:

Which anatomy is identified by #4 on this image?

Which technique best differentiates true biliary sludge from pseudosludge caused by slice-thickness artifact?

A patient with a history of a recent ERCP procedure presents for an abdominal scan. The sonographer notes linear hyper-echogenic foci with dirty shadowing tracking along the intrahepatic portal triads. What does this represent?

A 55-year-old female presents with these following findings which are indicative of:

An elderly diabetic patient presents with severe RUQ pain, fever, and sepsis. Ultrasound demonstrates high-amplitude echogenic foci with ringdown artifacts arising directly within the gallbladder wall. What is the diagnosis?

In an average adult patient, what is the accepted upper limit of normal internal measurement for the main pancreatic duct in the body of the gland?