Optic nerve extension of intraocular neoplasms

Area of Science:

• Ophthalmology
• Oncology
• Pathology

Background:

• Intraocular melanomas, including choroidal and iris/ciliary body types, present a risk for optic nerve invasion.
• Tumor cell dispersion into the vitreous is a noted phenomenon in these ocular tumors.
• Angle-closure glaucoma is frequently observed in eyes with intraocular melanomas and retinoblastomas.

Purpose of the Study:

• To investigate the extent of optic nerve invasion in intraocular melanomas.
• To explore the relationship between intraocular melanomas, optic nerve invasion, and glaucoma.
• To examine the potential role of glaucoma in enhancing tumor cell dispersion and optic nerve invasion.

Main Methods:

• Histologic examination of ten intraocular melanomas (eight choroidal, two iris/ciliary body).
• Assessment of optic nerve invasion and tumor cell dispersion into the vitreous.
• Review of a companion study on 38 retinoblastomas with optic nerve invasion.

Main Results:

• Optic nerve invasion was observed in all ten melanomas, varying in severity.
• Nine of ten melanomas showed partial necrosis.
• Orbital recurrence occurred in four cases with tumor extension to the optic nerve margin.
• All affected eyes had no light perception and angle-closure glaucoma.
• A high incidence of angle-closure glaucoma (29/38) was found in retinoblastomas with optic nerve invasion.

Conclusions:

• Intraocular melanomas frequently invade the optic nerve, with potential for orbital recurrence.
• Glaucoma-induced obstruction of aqueous outflow may facilitate posterior tumor cell dispersion and optic nerve head invasion.
• The findings suggest a link between glaucoma and enhanced tumor spread in intraocular malignancies.