A 46-year-old woman presents with a 6-month history of vague upper abdominal pain after fatty meals, some abdominal distension, and frequent indigestion. Physical examination shows an obese woman (BMI =32 kg/m2) with right upper quadrant tenderness. A CT scan discloses gallstones and an ectopic kidney. Which of the following is the expected location of the ectopic kidney?

**Core Concept**
The question tests the understanding of the embryological development and anatomical variations of the kidney. The ectopic kidney is a congenital anomaly where the kidney develops outside its normal location in the retroperitoneal space. The most common locations for an ectopic kidney are along the path of the ureteric bud.

**Why the Correct Answer is Right**
The correct answer is related to the development of the kidney. The ectopic kidney is usually located along the path of the ureteric bud, which is a branch of the mesonephric duct. The mesonephric ducts are the precursors to the ureters and the collecting system of the kidneys. The ectopic kidney can be found near the site where the ureteric bud connects with the metanephric blastema, which forms the functional kidney tissue. In this case, the ectopic kidney is likely located near the pelvic brim, where the ureteric bud usually connects with the metanephric blastema.

**Why Each Wrong Option is Incorrect**
* **Option A:** The left kidney is not a common location for an ectopic kidney, as the left ureteric bud typically develops normally and connects with the metanephric blastema.
* **Option B:** The pelvic floor is a possible location for an ectopic kidney, but it is not the most common location, and the question is looking for the most likely location.
* **Option D:** The liver is not a typical location for an ectopic kidney, as the kidney develops from the metanephric blastema, which is separate from the liver.

**Clinical Pearl / High-Yield Fact**
Ectopic kidneys are often asymptomatic but can be associated with urinary tract infections, kidney stones, or other complications. A CT scan is the best imaging modality to diagnose an ectopic kidney.

**Correct Answer:** C. Near the pelvic brim, near the site where the ureteric bud connects with the metanephric blastema.

✓ Correct Answer: D. Pelvis