A 35-yr-old lady with a chronic backache. On X-ray she had a D12 collapse. But Intervertebral disc space is maintained. All are possible except –
**Core Concept**
The question is testing the understanding of spinal anatomy and pathology, specifically the distinction between vertebral body collapse and intervertebral disc space narrowing. **Osteoporosis** and **trauma** are common causes of vertebral body collapse, while **disc degeneration** typically affects the intervertebral disc space.
**Why the Correct Answer is Right**
Given that the intervertebral disc space is maintained, the collapse of D12 is likely due to a process affecting the vertebral body itself, such as **osteoporosis** or **osteonecrosis**, rather than disc disease. This suggests that options related to disc pathology might be incorrect.
**Why Each Wrong Option is Incorrect**
**Option A:** Could be a possibility if it relates to vertebral body pathology.
**Option B:** Might be incorrect if it implies disc space narrowing, which is not present.
**Option C:** Could be a correct possibility depending on the nature of the option, but without specifics, it's hard to judge.
**Option D:** If this option implies a condition that primarily affects the disc space, it would be incorrect given the maintained disc space.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that maintenance of the intervertebral disc space in the context of vertebral body collapse points towards a process primarily affecting the bone, such as **osteoporotic compression fracture**.
**Correct Answer:** D. Osteochondritis