A 10-mm calculus in the right lower ureter associated with proximal hydroureteronephrosis is best treated with:
**Core Concept**
Ureteral calculi can cause obstructive uropathy, leading to proximal hydroureteronephrosis. The management of ureteral calculi depends on their location, size, and associated complications. Minimally invasive techniques have become the preferred treatment options for ureteral stones, especially in the lower ureter.
**Why the Correct Answer is Right**
Ureteroscopic retrieval is a minimally invasive procedure that involves the insertion of a ureteroscope through the urethra and bladder to access the ureter and remove the stone. This method is particularly useful for lower ureteral stones, as it allows for direct visualization and manipulation of the stone. The use of a ureteroscope also enables the simultaneous treatment of any associated ureteral strictures or other pathology. Additionally, ureteroscopic retrieval can be performed under general or regional anesthesia, depending on the patient's preference and medical condition.
**Why Each Wrong Option is Incorrect**
**Option A:** Extracorporeal shockwave lithotripsy (ESWL) is a suitable treatment option for upper ureteral stones or larger stones. However, its effectiveness decreases for lower ureteral stones, as the stone may not be adequately fragmented or cleared, leading to potential complications.
**Option B:** Antegrade percutaneous access involves inserting a tube into the kidney under imaging guidance to bypass the obstruction. This method is typically reserved for patients with severe hydronephrosis, kidney damage, or failed endoscopic attempts. It is a more invasive procedure with associated risks of bleeding and infection.
**Option C:** Open ureterolithotomy is a surgical procedure that involves making an incision in the abdomen to access the ureter and remove the stone. This method is generally reserved for large or complex stones, or in cases where other minimally invasive techniques have failed. It carries a higher risk of complications compared to endoscopic methods.
**Clinical Pearl / High-Yield Fact**
When considering the management of ureteral calculi, it is essential to assess the stone's size, location, and associated complications. Minimally invasive techniques, such as ureteroscopic retrieval, should be the initial treatment of choice for lower ureteral stones, as they offer a high success rate with minimal morbidity.
**✓ Correct Answer: D. Ureteroscopic retrieval. Ureteroscopic retrieval is a minimally invasive procedure that allows for direct visualization and removal of the ureteral calculus.**