**Core Concept**
The "golf-hole ureter" is a radiological term describing a specific appearance of the ureter on imaging studies. It refers to a ureteric stricture or obstruction that causes a localized dilatation of the ureter, resembling the hole in a golf ball.

**Why the Correct Answer is Right**
The golf-hole ureter is typically seen in cases of ureteric obstruction or stricture, often due to external compression from adjacent structures such as lymph nodes, tumors, or inflammatory processes. This compression leads to a proximal ureteral dilatation, while the distal ureter becomes narrowed and "golf-hole" shaped. The pathophysiology involves a combination of increased intraluminal pressure and altered ureteral peristalsis in response to the obstruction.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the characteristic appearance of the golf-hole ureter. Other terms like "beaded" or "cobblestone" ureter might be seen in different conditions.
* **Option B:** This option is incorrect because it does not specifically relate to the ureteric stricture or obstruction that causes the golf-hole ureter appearance.
* **Option C:** This option is incorrect because it is a general term for ureteral dilatation, which can be seen in various conditions, not specifically the golf-hole ureter.

**Clinical Pearl / High-Yield Fact**
In clinical practice, the golf-hole ureter is often a sign of underlying malignancy or lymphadenopathy. It is essential to consider this radiological finding in the context of a patient's overall clinical presentation and other imaging findings.

**Correct Answer: B. Ureteric stricture or external compression.**