## **Core Concept**
Congenital Pelvic-Ureteric Junction (PUJ) obstruction is a condition where there is a blockage in the flow of urine from the renal pelvis to the ureter, present at birth. This obstruction can lead to hydronephrosis, renal damage, and potentially, renal failure if not addressed. The condition often presents with symptoms like abdominal pain, urinary tract infections, or an abdominal mass.

## **Why the Correct Answer is Right**
The correct answer, although not directly provided, needs to be evaluated based on common facts about congenital PUJ obstruction. Typically, this condition is characterized by:

- **Anatomical issues:** Such as kinking or folding of the ureter, or the presence of a ureteral valve.
- **Intrinsic narrowing:** Due to abnormal development of the PUJ.
- **Extrinsic compression:** From aberrant vessels or fibrosis.

## **Why Each Wrong Option is Incorrect**
Without specific details on options A, B, C, and D, a general approach to evaluating incorrect statements about congenital PUJ obstruction:

- **Option A:** If it suggests that congenital PUJ obstruction is always symptomatic at birth, this is incorrect because many cases are diagnosed prenatally or present later in life.
- **Option B:** If it implies that surgical intervention is never required, this would be incorrect as many cases require surgical correction to prevent long-term renal damage.
- **Option C:** If it states that the condition only affects one kidney, this is incorrect because while it often presents unilaterally, it can occur bilaterally.
- **Option D:** If it mentions a specific detail that contradicts established knowledge about congenital PUJ obstruction, it would be incorrect based on that specific contradiction.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that congenital PUJ obstruction can often be diagnosed antenatally through ultrasound, showing signs of fetal hydronephrosis. Postnatally, the condition may be confirmed with imaging studies like ultrasound, CT urogram, or MAG3 scan, and treatment often involves surgical correction, such as pyeloplasty.

## **Correct Answer: D.**