In a duplicated collecting system, the ridge of renal cortex separating the two renal pelvi is called?

In a duplicated collecting system, the ridge of renal cortex separating the two renal pelvi is called?

• A. Renal septum
• B. Cortical break
• C. Calyceal spur
• D. Pleural ridge

Answer: (B)

In a duplicated collecting system, there are two separate collecting setups inside one kidney, so a strip of renal cortex sits between the two pelves. On ultrasound this separation often appears as a distinct cortical line or ridge that looks like the cortex has a break where it splits to enclose the two pelves. That cortical break description specifically conveys the cortical tissue forming the divider between the two collecting systems, which is why it’s the best term for this feature. The other terms don’t fit this imaging finding: a renal septum isn’t the usual descriptor for this cortical divider, a calyceal spur refers to a projection between calyces rather than the separation of the two pelves, and a pleural ridge is unrelated anatomy.

In a duplicated collecting system, there are two separate collecting setups inside one kidney, so a strip of renal cortex sits between the two pelves. On ultrasound this separation often appears as a distinct cortical line or ridge that looks like the cortex has a break where it splits to enclose the two pelves. That cortical break description specifically conveys the cortical tissue forming the divider between the two collecting systems, which is why it’s the best term for this feature.

The other terms don’t fit this imaging finding: a renal septum isn’t the usual descriptor for this cortical divider, a calyceal spur refers to a projection between calyces rather than the separation of the two pelves, and a pleural ridge is unrelated anatomy.