Okay, let's tackle this question about the inverted Lasègue sign. First, I need to recall what the Lasègue sign is. From what I remember, the Lasègue sign, also known as the straight leg raise test, is used to assess for lumbar nerve root irritation, especially in conditions like sciatica or herniated discs. When the patient lies flat and the leg is raised, if it causes pain, it's a positive Lasègue sign, indicating nerve root compression.

But the question is about the inverted Lasègue sign. I think the inverted version might refer to a different scenario. Maybe when raising the leg doesn't cause pain, but lowering it does. I've heard that in certain conditions, such as spinal stenosis or disc herniation, the pain might be elicited when the leg is lowered, not when raised. That's called the inverted or crossed Lasègue sign. So the inverted sign is positive when lowering the leg causes pain, which suggests a different pathology than the standard sign.

The options for the question are missing, but the correct answer is supposed to be the lesion type where this inverted sign is seen. Common lesions that might present with this sign include lumbar disc herniation, spinal stenosis, or other conditions affecting the nerve roots. Let me think: in spinal stenosis, the narrowing of the spinal canal leads to pain on exertion, and certain maneuvers that increase spinal canal pressure (like bending backward) might exacerbate symptoms. But the inverted Lasègue is more specific to disc herniation where the pain is provoked by specific leg movements.

Wait, I need to make sure. The standard Lasègue is for sciatica from disc herniation. The inverted version is when the pain occurs when the leg is lowered after being raised. This is more specific to certain types of nerve compression, perhaps where there's a different mechanical effect. For example, when the leg is lowered, the disc may shift slightly, pressing on the nerve root. So the inverted sign is more associated with disc herniation, especially when the herniation is posterior or when there's a sequestrated fragment.

Now, the options might include things like lumbar spondylolisthesis, spinal stenosis, disc herniation, or others. The correct answer would be disc herniation. The other options are incorrect because spinal stenosis might present with neurogenic claudication, which is relieved by sitting or bending forward, not necessarily the inverted Lasègue. Spondylolisthesis might cause pain with certain movements but not specifically the inverted sign. So the key is to link the inverted Lasègue to the disc herniation pathology.

**Core Concept**
The inverted Lasègue sign (also called the crossed Lasègue sign) is a clinical maneuver used to detect **lumbar disc herniation**, particularly when the herniated disc compresses the L5 or S1 nerve roots. It involves raising the contralateral (unaffected) leg and observing for pain in the affected side, indicating nerve root irritation.

**Why the Correct Answer is Right**
A positive inverted Lasègue sign occurs when raising the opposite leg (e.g., the left leg) elicits pain in the affected side (e.g., the right leg). This happens in **lumbar disc herniation** because flexion of the contralateral leg increases intr

✓ Correct Answer: C. L3