**Question:** The most common sequelae of tuberculous spondylitis is:

A. Diskitis
B. Syringomyelia
C. Kyphosis
D. Spinal cord compression

**Core Concept:** Tuberculous spondylitis is a form of tuberculosis that affects the spine, typically involving the vertebrae, intervertebral discs, and joints. The disease is caused by the bacterium Mycobacterium tuberculosis and can lead to inflammation, destruction of bone, and formation of abscesses.

**Why the Correct Answer is Right:** The correct answer, D. Spinal cord compression, is justified because tuberculous spondylitis can lead to severe spinal cord involvement. As the infection progresses, it can cause destruction of vertebrae, leading to collapse and instability of the spine. This can result in spinal cord compression, which can cause neurological deficits, such as sensory loss, motor weakness, or bladder and bowel dysfunction.

**Why Each Wrong Option is Incorrect:**

A. Diskitis (Option A): While tuberculous spondylitis may involve the intervertebral discs, the most common sequelae is spinal cord compression, not diskitis. Diskitis refers to infection of the intervertebral disc, which is less severe than spinal cord compression.

B. Syringomyelia (Option B): Syringomyelia is a condition characterized by the formation of a fluid-filled cavity within the central canal of the spinal cord. It is unrelated to the direct consequences of tuberculous spondylitis and is not the most common sequelae.

C. Kyphosis (Option C): Kyphosis refers to an abnormal curvature of the spine, often caused by spinal cord compression or other spinal disorders. While kyphosis can result from tuberculous spondylitis, spinal cord compression is more directly related to the disease process.

**Clinical Pearl:** Tuberculous spondylitis should be suspected in patients presenting with back pain, fever, and neurological symptoms, particularly those from endemic areas. Prompt diagnosis and treatment can prevent severe complications like spinal cord compression.