A. Endophytic retinoblastoma.
B. Exophytic retinoblastoma.
Ans:A. Endophytic retinoblastoma.
Three types of retinoblastoma are classified based on how they grow:
- endophytic retinoblastoma
- Endophytic retinoblastoma is a tumour that grows through the inner layer of the retina.
- An endophytic growth pattern is usually associated with pieces of tumour floating in the vitreous and aqueous humour (called vitreous seeding).
- Feature: Cottage cheese appearance ( as shown in the picture above).
- Exophytic retinoblastoma is a tumour that grows in between the layers of the retina.
- It often causes a tear in the retina (detached retina).
- diffuse infiltrating retinoblastoma
Diffuse infiltrating retinoblastoma is a rare type of retinoblastoma.
- It doesn’t usually form a tumour, but tumour cells grow along the retina.
- This type of retinoblastoma tends to be slow-growing and is usually found in school-aged children.