**Question:** Radiotherapy is used in treatment of angiofibroma when it involves:

A. Soft tissue
B. Bone
C. Nerve
D. Airway

**Core Concept:**
Angiofibroma is a benign tumor of the head and neck region, most commonly found in the nasopharynx in males during the adolescent years. It is a type of angioectasia (abnormal dilation of blood vessels) and fibroepithelial proliferation. Radiotherapy is a modality used in the treatment of angiofibroma, usually when surgery is contraindicated or incomplete due to its deep location, proximity to critical structures, or recurrent nature.

**Why the Correct Answer is Right:**
Certain situations where radiotherapy is preferred over surgery or combined with surgery include:
1. Involvement of critical structures: Radiotherapy can deliver a precise dose of radiation to the tumor while sparing surrounding healthy tissues, reducing potential complications like facial nerve palsy, osteoradionecrosis, or airway obstruction.
2. Deep tumor location: Radiotherapy can effectively target the tumor without the need for invasive surgery.
3. Recurrent or persistent angiofibroma: Radiotherapy may be used to control tumor growth or prevent recurrence, especially when surgery has been performed previously and may have left residual or recurrent tumor.

**Why Each Wrong Option is Incorrect:**
A. Soft tissue (Option A): Radiotherapy is not primarily used for soft tissue tumors but rather for tumors involving critical structures or deep-seated lesions.
B. Bone (Option B): Radiotherapy is not primarily used for bone tumors, except in cases where surgery is contraindicated or incomplete due to the tumor's location or involvement of critical structures.
C. Nerve (Option C): Radiotherapy is generally not preferred for tumors involving nerves due to the risk of nerve injury. Treatment options for nerve tumors include surgery, chemotherapy, or targeted therapies like tyrosine kinase inhibitors (e.g., imatinib).
D. Airway (Option D): Radiotherapy can be used when surgery is contraindicated or incomplete due to tumor location or airway obstruction, or when the tumor recurs after surgery.

**Clinical Pearl:**
In cases of angiofibroma involving critical structures or deep-seated lesions, radiotherapy can provide effective treatment or palliation without the risks associated with surgery, particularly in recurrent or inaccessible tumors. Consultation with a radiation oncologist is essential to determine the appropriate treatment plan considering the tumor's location, size, and involvement of surrounding structures.