**Question:** All are true about posteromedial surface of kidney, EXCEPT:

A. It contains renal sinus and renal artery originating from abdominal aorta.
B. It is richly supplied by renal vessels.
C. It has renal vein draining into vena cava.
D. It does not have any fat tissue.

**Core Concept:** The posteromedial surface of the kidney plays a crucial role in understanding the anatomy, blood supply, and drainage of the kidney. It is essential for understanding the renal vasculature and venous drainage.

**Why the Correct Answer is Right:**
Option D, "It does not have any fat tissue," is incorrect because the posteromedial surface of the kidney does contain fat tissue, which serves as an adipose tissue layer surrounding the kidney for protection, insulation, and support. Fat tissue is vital for maintaining the kidney's structural integrity and overall functioning.

**Why Each Wrong Option is Incorrect:**
Option A is correct as it highlights the presence of the renal sinus and renal artery originating from abdominal aorta. The renal sinus is a complex of blood vessels, lymphatics, and nerves surrounding the renal artery, which helps in understanding the renal blood supply and drainage.

Option B is correct as it emphasizes the rich blood supply by renal vessels, which is essential for maintaining the kidney's function and survival.

Option C is correct as it highlights the renal vein draining into the vena cava, which is crucial for understanding the kidney's venous drainage and its connection to the circulatory system.

**Clinical Pearl / High-Yield Fact:**
Understanding the posteromedial surface of the kidney helps in appreciating the vital structures and functions of this region. It is important for medical students, residents, and practicing physicians to comprehend the renal vasculature, fat tissue, renal sinus, renal artery, renal vein, and renal artery drainage. Knowledge of these factors is necessary for diagnosing renal diseases, managing patients with renal problems, and performing surgical procedures involving the kidney.