What are the most common primary intraocular tumors in adults?

• A. Choroidal melanoma
• B. Retinoblastoma
• C. Ciliary body adenoma
• D. Metastatic lesions to the choroid

Answer: (A)

Choroidal melanoma is the most common primary intraocular tumor in adults because it arises from the melanocytes in the uveal tract, with the choroid containing the largest reservoir of these pigmented cells. Malignant transformation of these uveal melanocytes leads to melanoma, which is the typical primary intraocular cancer seen in adults.

Retinoblastoma is a childhood tumor, driven by RB gene alterations, and thus not a tumor seen in adults. Ciliary body adenoma is rare and not the common entity. Metastatic lesions to the choroid are not primary tumors; they represent cancers that have spread to the eye from elsewhere, not tumors that originate in the eye itself.