**Question:** The large kidney is seen in A/E -

A. Hydronephrosis
B. Nephrolithiasis
C. Acute kidney injury
D. Congenital anomalies of the kidney and urinary tract (CAKUT)

**Core Concept:** Large kidney on abdominal examination (A/E) can indicate various pathological conditions affecting the kidney's size, shape, or palpability.

**Why the Correct Answer is Right:**

Correct Answer: **D. Congenital anomalies of the kidney and urinary tract (CAKUT)**

D. CAKUT encompasses a group of kidney and urinary tract malformations that occur during fetal development. In this context, a large kidney on A/E can indicate an enlarged kidney due to a congenital abnormality.

**Why Each Wrong Option is Incorrect:**

A. **Hydronephrosis (Option A)** involves fluid accumulation in the renal pelvis or ureter, causing the kidney to become enlarged. However, in CAKUT, the enlargement is due to intrinsic renal anomalies rather than obstructive etiology.

B. **Nephrolithiasis (Option B)** refers to the presence of kidney stones, which are not the cause of a large kidney in this context.

C. **Acute kidney injury (Option C)** refers to acute kidney dysfunction, not necessarily associated with an enlarged kidney on A/E.

**Clinical Pearl:** While all options can lead to a large kidney on A/E, the correct answer (CAKUT) highlights the importance of considering developmental kidney anomalies in the differential diagnosis. A thorough clinical history, physical examination, and further investigations are crucial to determine the exact cause and appropriate management plan.