## **Core Concept**
The question assesses knowledge of radiological signs associated with increased intracranial pressure (ICP) in pediatric patients. In infants and children, the skull can expand, allowing for some degree of compensation for rising ICP before significant changes are evident on imaging. The most notable and early radiological sign on plain X-ray relates to changes in the sutures.

## **Why the Correct Answer is Right**
The correct answer, **. Sprung Suture**, is right because the first and most prominent radiological sign of raised intracranial tension in infants and children on plain X-ray is indeed the "sprung suture" or suture diastasis. This occurs due to the increased intracranial pressure causing separation of the cranial sutures. This sign is particularly relevant in pediatric patients because their cranial sutures have not yet fused, allowing for this compensatory mechanism.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because, although it might relate to another radiological finding, it does not accurately represent the first and most prominent sign of raised ICP in infants and children on plain X-ray.
- **Option B:** This option is incorrect as it does not specify the correct radiological sign associated with increased ICP in pediatric patients.
- **Option D:** This option is incorrect because it does not accurately describe the initial radiological change seen with elevated ICP in infants and children.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that in pediatric patients, due to open fontanelles and sutures, the signs of increased ICP might differ from adults. The "sprung suture" or suture diastasis is a critical early sign that should prompt further investigation and possible intervention to manage the elevated ICP.

## **Correct Answer:** . Sprung Suture