**Question:** Tumour which can occur following exposure to radiation is: March 2009

**Core Concept:** Radiation-induced tumors are malignancies that develop as a consequence of ionizing radiation exposure. Ionizing radiation damages DNA, leading to mutations and subsequent uncontrolled cell proliferation, ultimately resulting in the formation of tumors. The process involves genetic instability, which can manifest as either a solid tumor or leukemia.

**Why the Correct Answer is Right:** The correct answer refers to the type of tumor that can develop as a result of radiation exposure. Radiation-induced tumors are a well-known consequence of high-dose ionizing radiation exposure, particularly in case of therapeutic radiation, nuclear accidents, or occupational exposure. The ionizing radiation damages DNA, leading to mutations, which in turn causes uncontrolled cell proliferation and forms solid tumors or sometimes, leukemia.

**Why Each Wrong Option is Incorrect:**

A. Leukemia (Option B) is not a specific type of tumor but a group of cancers affecting blood cells and bone marrow. While radiation exposure is a known risk factor for leukemia, this option is incorrect because it does not represent a solid tumor.

B. Leukemia (Option A) is similar to Option B but is incorrect as it is a group of cancers affecting blood cells and bone marrow, not a specific type of solid tumor.

C. Angioma (Option C) refers to benign tumors of blood vessels, which are not the correct answer to the question. Angiomas are not related to radiation exposure and represent a different type of tumor.

D. Angioma (Option D) is similar to Option C but is incorrect as it is a benign tumor of blood vessels, not a type of solid tumor.

**Clinical Pearl:** The correct answer is radiation-induced solid tumors (not specified in options), which can occur as a result of ionizing radiation exposure. These tumors are a known consequence of high-dose radiation therapy, nuclear accidents, or occupational exposure. Understanding the link between radiation and tumor development is essential for healthcare professionals to counsel patients and provide appropriate care for individuals with a history of radiation exposure.