Serial Detection of L265P Mutation in the Aqueous Humor of a Patient with Vitreoretinal Lymphoma for Disease Monitoring.

PURPOSE

To report a case of a patient whose mutation disappeared from the aqueous humor following treatment with intravitreal methotrexate.

METHODS

A retrospective review of clinical, histopathological and imaging records.

RESULTS

A 49-year-old woman presented with bilateral primary vitreoretinal lymphoma confirmed by molecular and next-generation sequencing studies on vitreous biopsy samples. Initially, the L265P mutation was detected in aqueous samples of both eyes. Serial testing for L265P mutations performed on aqueous samples collected at the time of the weekly intravitreal methotrexate injections showed the mutation ceased to be detected after four weekly injections in the non-vitrectomized right eye and after two weekly injections in the vitrectomized left eye. Clinical improvement accompanied the negativization of the mutation in both eyes.

CONCLUSION

We present a case that demonstrates the possible utilization of serial testing for the L265P mutation as a tool for monitoring disease course in vitreoretinal lymphoma.