Infection of all the following structures can be cause of Psoas abscess except-
**Core Concept**
Psoas abscess is a collection of pus in the psoas major muscle, typically resulting from a contiguous spread of infection from adjacent structures or via hematogenous spread. The psoas major muscle is located in the retroperitoneal space, making it susceptible to infection from nearby structures.
**Why the Correct Answer is Right**
The most common causes of psoas abscess include infections of the spine (e.g., discitis or osteomyelitis), the kidney (e.g., pyelonephritis), and the abdominal organs (e.g., appendicitis or diverticulitis). Infections of these structures can spread to the psoas muscle via direct extension or through the bloodstream. The psoas muscle's location in the retroperitoneal space, surrounded by the peritoneum and other structures, makes it prone to infection from nearby sources.
**Why Each Wrong Option is Incorrect**
**Option A:** Psoas abscess can be caused by infection of the spine, including discitis or osteomyelitis, which is a common cause. Therefore, this option is incorrect.
**Option B:** Infection of the kidney, such as pyelonephritis, can also lead to psoas abscess, making this option incorrect.
**Option C:** Infection of the abdominal organs, like appendicitis or diverticulitis, can also cause psoas abscess, so this option is incorrect.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that psoas abscess can be a complication of various infections, and a high index of suspicion is necessary for early diagnosis and treatment.
**Correct Answer:** D.