Which anatomic structure is not demonstrated on a KUB?

Which anatomic structure is not demonstrated on a KUB?

• A. Bone structure of the pelvis
• B. Inferior ribs
• C. Psoas muscles
• D. Minor calyces

Answer: (D)

On a KUB you get a broad view of the abdomen that shows the pelvis bones, the lower ribs, and soft-tissue outlines like the psoas muscles, along with the outlines of the kidneys and bladder. However, the internal details of the kidney’s collecting system, specifically the minor calyces, are too small to resolve on a standard plain radiograph. To visualize the calyces clearly, you’d need an imaging modality that outlines the renal collecting system with contrast, such as an intravenous urography or CT urography. So the minor calyces are not demonstrated on a routine KUB, while the bone structure of the pelvis, inferior ribs, and psoas muscles typically are visible.

On a KUB you get a broad view of the abdomen that shows the pelvis bones, the lower ribs, and soft-tissue outlines like the psoas muscles, along with the outlines of the kidneys and bladder. However, the internal details of the kidney’s collecting system, specifically the minor calyces, are too small to resolve on a standard plain radiograph. To visualize the calyces clearly, you’d need an imaging modality that outlines the renal collecting system with contrast, such as an intravenous urography or CT urography. So the minor calyces are not demonstrated on a routine KUB, while the bone structure of the pelvis, inferior ribs, and psoas muscles typically are visible.