A 3-year-old male child diagnosed to have acute UTI developed left flank pain on ultrasonogram, the left ureter was found to be duplicated the most probable site of the opening of ectopic ureter will be –
**Core Concept**
The question requires knowledge of the anatomical variations and complications associated with duplicated ureters, specifically the ectopic ureter. Ectopic ureters are a type of ureteral anomaly where the ureter opens abnormally, either above or below the normal ureterovesical junction.
**Why the Correct Answer is Right**
In duplicated ureters, the ectopic ureter often arises from the upper pole of the duplicated system. Since the child developed left flank pain, which is suggestive of a ureteropelvic junction obstruction or ectopic ureter, the most probable site of the opening of the ectopic ureter would be in the bladder neck or prostate. This is because the ectopic ureter typically opens into the bladder neck or prostatic urethra, leading to symptoms of urinary incontinence, recurrent UTIs, or obstructive uropathy.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the ectopic ureter is less likely to open into the seminal vesicles, which are not a common site for ectopic ureteral openings.
* **Option B:** This option is incorrect because the ureterovesical junction is the normal site for ureteral openings, not ectopic ureters.
* **Option C:** This option is incorrect because the ectopic ureter is less likely to open into the vas deferens, which is a male reproductive structure.
**Clinical Pearl / High-Yield Fact**
In children with duplicated ureters, the ectopic ureter is more likely to be associated with the upper pole of the duplicated system, and the most common site of ectopic ureteral opening is the bladder neck or prostate.
**Correct Answer: A. Bladder neck or prostate.**