What anatomical feature is characterized by a double collecting system?

A ureterocele is an anatomical feature that can be associated with a double collecting system, which refers to the presence of two separate renal collecting systems in a single kidney. This condition is often due to an incomplete development or duplication of the ureter, leading to the formation of an abnormal pouch or ureterocele at the junction where the ureter meets the bladder.

These double collecting systems can result in various clinical manifestations, including urinary obstruction or reflux, depending on how they are configured and where the ureterocele forms. Ureteroceles are typically identified in the context of imaging studies such as ultrasounds, where the characteristic cystic structure can be seen causing posterior urethral obstruction or associated complications.

Understanding ureteroceles and their association with a double collecting system is crucial for diagnosing and managing urological conditions. This contrasts with other conditions listed, such as hydronephrosis, renal agenesis, and supernumerary kidney, which do not inherently reflect the specific anatomical feature of a duplicated collecting system.