Optic nerve head reactive retinal astrocytic tumor treated with photodynamic therapy

Purpose: To describe the unusual presentation and the treatment course of a case of bilateral optic nerve head reactive retinal astrocytic tumor (RRAT).

Observations: A 29 year-old woman with bilateral optic disc masses presented with declining vision refractory to anti-vascular endothelial growth factor (VEGF) injections. After total loss of vision in her left eye, diagnostic enucleation and histopathology was consistent with RRAT. Staged photodynamic therapy (PDT) treatments over a period of four months in the better seeing eye resulted in stabilization of vision, improvement in intraretinal and subretinal fluid, and shrinkage of the optic disc mass.

Conclusions: In this unusual case of bilateral vision-threatening optic nerve head RRAT that were refractory to multiple therapies including anti-VEGF injections, PDT demonstrated safety and efficacy. Diagnostic work-up included whole exome sequencing (WES) that was negative for mutations in genes related to von-Hippel-Lindau (VHL), neurofibromatosis, tuberous sclerosis, and hypoxia-inducible factor (HIF)-2 $\alpha$ .

Keywords: Photodynamic therapy; Reactive retinal astrocytic tumor; Vasoproliferative retinal tumor.