Blurred vision as presenting symptom of brain tumor

Case history

A 75 year old women presents with decreased vision in the right eye for the last three months. 

Past medical history:

Arthritis and low blood pressure.

Past ocular history:

Bilateral cataract extraction several years ago.

Exam:

Vision with current glasses is count fingers in the right eye, and 20/40 in the left.

Dilated retinal exam:

Dense epiretinal membrane through central macula in the right eye.

Right eye:

Fluorescein angiogram:

Some sublte leakage of the parafoveal vessels in the right eye.

Right eye at about 30 seconds:
Right eye at about 5 minutes:

Optical coherence tomography:

Increased retinal thickening with prominent ERM.