## **Core Concept**
Retinoblastoma is a malignant tumor of the retina, primarily affecting children. The management of retinoblastoma depends on the extent of the disease, including the number and location of tumors, and whether the disease is unilateral or bilateral. The goal is to preserve life, salvage the globe if possible, and maintain vision.

## **Why the Correct Answer is Right**
In this scenario, the patient has unilateral advanced retinoblastoma in one eye and early-stage disease in the other eye. For the eye with advanced disease (full eyeball involvement), **enucleation (surgical removal of the eye)** is often recommended as the primary treatment to ensure the best chance of cure, given the extensive tumor involvement which likely compromises vision and poses a high risk of extraocular extension. For the other eye with 2-3 small peripheral lesions, **chemotherapy and/or local treatments like laser photocoagulation or cryotherapy** can be effective in preserving vision and controlling the disease.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, treatments that are less aggressive than needed for advanced unilateral disease or more aggressive than necessary for early-stage bilateral disease would be incorrect.
- **Option B:** Similarly, without specifics, any option suggesting inappropriate management, such as chemotherapy alone for advanced unilateral disease or enucleation for the eye with only small peripheral lesions, would be incorrect.
- **Option C:** This would be incorrect if it suggests a treatment plan that does not adequately address the advanced nature of the disease in one eye or over-treats the less affected eye.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **retinoblastoma management often involves a multidisciplinary approach**, including ophthalmology, oncology, and sometimes radiation therapy. **Enucleation is a curative for intraocular disease that is very advanced** and can be lifesaving. Early detection and treatment significantly improve outcomes in retinoblastoma.

## **Correct Answer:** .