**Question:** The most common second malignant in survivors of retinoblastoma is:

A. Lymphoma
B. Glioma
C. Soft tissue sarcoma
D. Acute leukemia

**Correct Answer:** D. Acute leukemia

**Core Concept:** Retinoblastoma is a rare, inherited or sporadic pediatric cancer of the retina. Survivors of retinoblastoma are at an increased risk for second primary malignancies due to the disruption of genomic stability caused by the tumor itself and the treatment modalities employed, such as ionizing radiation and chemotherapy.

**Why the Correct Answer is Right:** Acute leukemia is a group of blood and bone marrow cancers characterized by the rapid proliferation of abnormal white blood cells. Survivors of retinoblastoma are at a higher risk of developing acute leukemia due to the exposure to ionizing radiation during treatment, which can lead to chromosomal abnormalities and hematopoietic stem cell damage.

**Why Each Wrong Option is Incorrect:**

A. Lymphoma: This is a group of cancers originating from lymphocytes. Although some lymphomas may occur in retinoblastoma survivors, acute leukemia is more common due to the mentioned treatment-related risks.

B. Glioma: Gliomas are brain tumors originating from glial cells. While survivors may develop brain tumors, acute leukemia is the most common second malignant neoplasm in retinoblastoma survivors.

C. Soft tissue sarcoma: This group of neoplasms involves the development of tumors in soft tissues, such as muscles, bones, and blood vessels. While soft tissue sarcomas may occur, acute leukemia is the most common second malignant neoplasm in retinoblastoma survivors.

**Clinical Pearl:** Retinoblastoma survivors should undergo regular follow-up surveillance, including physical examinations, ophthalmologic evaluations, and blood tests, to detect second primary malignancies early. Early detection and prompt intervention improve outcomes for these patients.