**Question:** Radiological appearance of rickets include all except

A. Increased bone density
B. Prominent and thin cortices
C. Normal bone density
D. Osteopenia

**Correct Answer:** C. Normal bone density

**Core Concept:** Rickets is a deficiency disorder of vitamin D and calcium, which leads to impaired mineralization of bone matrix resulting in soft and pliable bones.

**Why the Correct Answer is Right:** The correct answer, "Normal bone density," refers to the characteristic radiological feature that rickets does not demonstrate. Healthy individuals typically present with normal bone density, while rickets results in reduced bone density due to impaired mineralization and softening of the bones.

**Why Each Wrong Option is Incorrect:**

A. Increased bone density (Osteopenia) is incorrect because, as mentioned above, rickets results in reduced bone density, not increased density.
B. Prominent and thin cortices refer to the increased radiolucency (transparency to X-rays) of the bone cortex in rickets. This is the opposite of what is expected in normal bone density, thus making it incorrect.
D. Osteopenia is another term for reduced bone density, similar to increased bone density (osteopenia), which is incorrect because it contradicts the characteristic feature of rickets.

**Clinical Pearl:**

Radiological features of rickets include:
1. Prominent and thin cortices (increased radiolucency)
2. Prominent medullary cavity
3. Increased bone fragility
4. Bowing of long bones
5. Plain radiographs may reveal rickety rachitis sign (bending of the long bones in the midshaft)

**Correct Answer Explanation:** The correct answer, "Normal bone density," is chosen because rickets is characterized by reduced bone density. The other options (increased density, thin cortices, and osteopenia) represent typical findings in healthy individuals, not those with rickets.