## **Core Concept**
The question pertains to radiological findings, specifically the "tram-track" or "tram line" calcification pattern observed in skull X-rays. This pattern is associated with certain pathological conditions affecting the brain or skull.

## **Why the Correct Answer is Right**
The correct answer, **C. Sturge-Weber syndrome**, is associated with "tram-track" calcifications due to the presence of **leptomeningeal angiomatosis**. This condition leads to calcification of the brain cortex beneath the angioma, resulting in a characteristic tram-track appearance on skull X-rays. The tram-track sign is a classic radiological feature of Sturge-Weber syndrome, which is a congenital disorder characterized by a **port-wine stain** on the face, typically along the distribution of the trigeminal nerve, and neurological abnormalities.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Not specified, but generally, conditions not associated with tram-track calcifications would not produce this specific pattern.
- **Option B:** Not specified, similarly, conditions not linked to leptomeningeal angiomatosis or similar pathological processes would not show tram-track calcifications.
- **Option D:** Not specified, any condition not characterized by the specific pathological changes seen in Sturge-Weber syndrome would not exhibit this radiological feature.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that Sturge-Weber syndrome is often associated with **seizures**, **intellectual disability**, and **ocular abnormalities**, in addition to the characteristic skin and radiological findings. The presence of tram-track calcifications is a diagnostic clue that can help in identifying this syndrome.

## **Correct Answer:** . Sturge-Weber syndrome