Most common presentation of Retinoblastoma
**Core Concept**
Retinoblastoma is a malignant tumor of the retina, primarily affecting children. It is the most common intraocular malignancy in children, accounting for approximately 3% of all childhood cancers. The tumor arises from the immature retinal cells.
**Why the Correct Answer is Right**
The most common presentation of retinoblastoma is leukocoria, which is the white reflex or white pupillary reflex in the eye. This occurs due to the tumor reflecting light back, giving the appearance of a white pupil. Leukocoria is often noticed by a parent or caregiver when taking a photograph of the child. Early detection is crucial for treatment and improving visual outcomes. The tumor can also be identified through indirect ophthalmoscopy or ultrasound.
**Why Each Wrong Option is Incorrect**
**Option A:** Strabismus is a possible presentation of retinoblastoma, but it is not the most common. Strabismus occurs when the tumor causes vision loss and the child develops an abnormal alignment of the eyes.
**Option B:** Seizures are not a direct presentation of retinoblastoma. While seizures can occur in children with retinoblastoma due to increased intracranial pressure or metastasis, they are not a primary symptom.
**Option C:** Vision loss or blindness is a potential complication of retinoblastoma, particularly if left untreated. However, it is not the most common presentation.
**Clinical Pearl / High-Yield Fact**
Retinoblastoma is a highly treatable cancer when detected early. Early signs of leukocoria or strabismus should prompt an ophthalmologic evaluation to rule out retinoblastoma.
**Correct Answer: C. Vision loss or blindness**