**Question:** The following is true of Robe's pelvis:

A. It is a common site for deep vein thrombosis in the lower limb.
B. It is a normal variant present in 15% of the population.
C. It is a sign of deep vein thrombosis (DVT).
D. It is a pathological condition requiring surgical intervention.

**Correct Answer:** B. It is a normal variant present in 15% of the population.

**Core Concept:** Robe's pelvis is a radiographic pelvic variant characterized by the presence of an additional radiolucent area between the greater sciatic notch and the posterior border of the ischium. It is named after the French radiologist, Georges Robe.

**Why the Correct Answer is Right:** Robe's pelvis is considered a normal variant, as it is observed in approximately 15% of the population. It represents a variation in the normal anatomy of the pelvis and does not pose any clinical significance or risk to the individual.

**Why Each Wrong Option is Incorrect:**

A. Robe's pelvis is not a common site for deep vein thrombosis (DVT) in the lower limb. DVT typically occurs in the iliac veins, popliteal veins, or lower leg veins, not specifically related to Robe's pelvis.

B. Although Robe's pelvis is a pelvic variant, option B emphasizes its presence as a common site for DVT, which is incorrect. DVT is more commonly associated with other anatomical factors like obesity, immobility, and obesity.

C. Robe's pelvis is not a sign of deep vein thrombosis (DVT). DVT is characterized by swelling, pain, erythema, and tenderness in the affected lower limb, not Robe's pelvis itself. This option is misleading as it incorrectly suggests that Robe's pelvis is a definitive sign of DVT.

D. Robe's pelvis is not a pathological condition requiring surgical intervention. This option misleads the reader to believe that Robe's pelvis is a pathological entity, which it is not. Surgical intervention is typically reserved for significant complications arising from DVT or other pelvic pathologies.

**Clinical Pearl:** Robe's pelvis is a normal anatomical variant that does not have any clinical significance or relevance to DVT or surgical intervention. It is essential for medical students and practitioners to recognize that Robe's pelvis is a normal variant with no clinical implications and should not be mistaken for a pathological entity or a diagnostic indicator of DVT.