## **Core Concept**
Caffey's disease, also known as infantile cortical hyperostosis, is a rare medical condition characterized by abnormal bone growth in infants. It primarily affects the cortical bone, leading to hyperostosis (an excessive growth of bone). The condition involves inflammation of the periosteum (the layer of dense irregular connective tissue enveloping the bones except at the surfaces of the joints), which results in new bone formation.

## **Why the Correct Answer is Right**
The correct answer, **C. Infantile cortical hyperostosis**, directly corresponds with the definition of Caffey's disease. This condition manifests with symptoms such as fever, swelling of soft tissues, and bone abnormalities visible on radiographs, typically presenting in infants. The pathophysiology involves an inflammatory process affecting the periosteum and cortex of bones, leading to hyperostosis.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify Caffey's disease or any related condition.
- **Option B:** Similarly, this option does not relate to Caffey's disease or infantile cortical hyperostosis.
- **Option D:** This option is also incorrect as it does not accurately describe Caffey's disease.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that Caffey's disease often presents with a triad of symptoms: fever, swelling of the affected area, and bone changes on X-ray. This condition typically has a self-limiting course, resolving on its own within a couple of years, though supportive care is often required to manage symptoms.

## **Correct Answer:** C. Infantile cortical hyperostosis