A renal cyst is a fluid-filled sac that forms in the kidneys. It is usually round or oval in shape and can vary in size. They are commonly benign and asymptomatic, detected incidentally during imaging tests done for other reasons. The characteristics of renal cysts seen in imaging may include:
Smooth, thin-walled structures.
Uniformly fluid-filled without any complex features.
This distinct appearance helps differentiate renal cysts from other potential kidney conditions listed in the options:
PKD (Polycystic Kidney Disease): Characterized by multiple cysts of varying sizes that cause the enlargement of kidneys.
Medullary Sponge Kidney: A congenital disorder where tiny cysts form in the inner part of the kidney, often described as having a "sponge-like" appearance.
PUJ Obstruction: A condition where a blockage occurs at the junction where the pelvis of the kidney meets the ureter, leading to swelling but not cyst formation.
In summary, based on the features typically associated with renal cysts and how they are visually differentiated from other conditions, the correct answer to the question is a Renal Cyst.
