**Question:** Pseudoclaudication is caused by:

A. Peripheral arterial disease
B. Intermittent claudication
C. Spinal cord compression
D. Disc herniation

**Core Concept:**
Pseudoclaudication is a clinical condition characterized by pain in the lower extremities, particularly in the thigh or buttock, during walking, which improves with rest. This condition is often mistaken for intermittent claudication (IC), the pain seen in peripheral arterial disease (PAD). However, the key difference lies in the relief of symptoms upon rest rather than exercise, which is the typical response in IC.

**Why the Correct Answer is Right:**
Pseudoclaudication is primarily caused by spinal cord compression (Option C). This can result from various conditions, such as spinal stenosis due to degenerative disc disease, osteophytes, or prior spinal surgery. When the spinal cord is compressed, walking triggers pain due to increased blood flow demand in the affected regions. Rest alleviates symptoms as the spinal cord recovers from the ischemic insult.

**Why Each Wrong Option is Incorrect:**

A. Peripheral arterial disease (PAD) is a separate entity causing intermittent claudication (IC), which is pain that worsens with walking and improves with rest. Pain in PAD is typically caused by reduced blood flow due to atherosclerosis in the lower extremities.

B. Intermittent claudication (IC) is a misnomer for pseudoclaudication, as IC truly worsens with walking (not improves). IC is associated with peripheral arterial disease (PAD), while pseudoclaudication is caused by spinal cord compression.

D. Disc herniation (Option D) can lead to radiculopathy, causing pain in the affected limb, but it does not result in pseudoclaudication due to pain relief with rest. Pain in a disc herniation remains constant regardless of activity level, worsening with movement.

**Clinical Pearl:** The distinction between pseudoclaudication and intermittent claudication is crucial for accurate diagnosis and treatment. Pseudoclaudication should prompt further evaluation for spinal cord compression, while intermittent claudication is a red flag for peripheral arterial disease, necessitating further assessment for atherosclerosis.