**Question:** True about Congenital Hemangioma:

A. It is the most common benign tumor in infants, accounting for up to 50% of all soft tissue tumors in the first year of life.
B. It is caused by an excessive proliferation of blood vessels due to a defect in the regulation of angiogenesis.
C. It is a malignant tumor and can lead to serious complications.
D. It resolves spontaneously in 90% of cases by puberty.

**Correct Answer:**

**Core Concept:** Congenital Hemangiomas are benign vascular tumors that occur in infants, usually present at birth or within the first few weeks of life. They are characterized by excessive angiogenesis (formation of new blood vessels) due to a defect in the regulation of angiogenesis.

**Why the Correct Answer is Right:**

B. Congenital Hemangiomas are indeed caused by an excessive proliferation of blood vessels due to a defect in the regulation of angiogenesis. This overgrowth of blood vessels results in the formation of a benign vascular tumor in infants.

**Why Each Wrong Option is Incorrect:**

A. While hemangiomas are common, they are not the most common benign tumor in infants. Other types, such as lipomas and fibromas, are more prevalent. Additionally, hemangiomas are not malignant tumors and do not have a high risk for complications.

C. Congenital hemangiomas are benign tumors and do not have the potential to become malignant. They may, however, cause complications if they are large or involve vital structures.

D. While the majority of hemangiomas involute (resolve) spontaneously, it is not accurate to say that they resolve in 90% of cases by puberty. In reality, most hemangiomas involute within the first few years of life, with only a minority persisting into childhood or adulthood.

**Clinical Pearl:**

The correct understanding of congenital hemangiomas is essential for healthcare professionals treating infants with vascular lesions. This knowledge helps in formulating an appropriate management plan and predicting the natural history of the lesion, thus preventing unnecessary interventions and complications.