**Question:** As regards to intraocular retinoblastoma, which one of the following statements is false –

A. Retinoblastoma is a rare form of childhood cancer originating from retinal cells.
B. Retinoblastoma typically affects infants and young children.
C. Retinoblastoma is caused by a genetic mutation in one of the RB1 genes.
D. Retinoblastoma is easily diagnosed through routine eye examination.

**Correct Answer:**

**Why the Correct Answer is Right:**

Retinoblastoma is indeed a rare form of childhood cancer, affecting mainly infants and young children. It arises from the malignant growth of retinal cells, making option D false.

**Why Each Wrong Option is Incorrect:**

A. While retinoblastoma is rare, option A is true as it highlights that the cancer originates from retinal cells and affects infants and young children.
B. Although retinoblastoma can manifest in infants and young children, option B is not entirely false, as the cancer might also affect older children and rarely, adults.
C. Option C is accurate as retinoblastoma is caused by a genetic mutation in one of the RB1 genes, which stands for "Rb." This gene encodes a tumor suppressor protein that plays a crucial role in regulating cell growth and differentiation.
D. Option D is false, as retinoblastoma typically requires specialized diagnostic procedures, such as ophthalmologic examination with fluorescence angiography and computed tomography (CT) scanning or magnetic resonance imaging (MRI) to diagnose the disease accurately. Routine eye examination may not always detect retinoblastoma, leading to its misdiagnosis or delayed diagnosis.

**Core Concept:**

Retinoblastoma is a rare form of childhood cancer caused by a genetic mutation in one of the RB1 genes. This mutation leads to uncontrolled cell growth and the formation of tumors in the retina and sometimes the choroid and vitreous humor. The cancerous cells can also invade surrounding tissues and in severe cases, spread to distant organs.

**Core Concept (Expanded):**

Retinoblastoma is a rare form of childhood cancer that primarily affects infants and young children. The disease originates from the malignant growth of retinal cells due to a genetic mutation in one of the RB1 genes. The RB1 gene encodes a tumor suppressor protein called retinoblastoma protein (Rb), which regulates cell growth and differentiation. When the RB1 gene is mutated, the Rb protein is non-functional, resulting in uncontrolled cell growth and the formation of tumors in the retina, choroid, and vitreous humor.

**Core Concept (Expanded):**

Retinoblastoma is a rare form of pediatric cancer that primarily affects infants and young children. This cancer stems from the malignant proliferation of retinal cells due to a genetic mutation in one of the RB1 genes. The RB1 gene produces a tumor suppressor protein called retinoblastoma protein (Rb), which regulates cell growth and differentiation. When the RB1 gene is mutated, the Rb protein becomes non-functional, causing uncontrolled cell growth and the formation of tumors in the retina, choroid, and vitre