Secondary glaucoma due to thrombosis of sigmoid and transverse sinus

An 88-year-old female presented with redness in the left eye of one-month duration. On examination, the left eye showed 3 mm of proptosis with dilated and tortuous episcleral vessels and relative afferent pupillary defect. Intraocular pressure was 60 mmHg and showed open angles on gonioscopy with cup disc ratio of 0.8 in OS. A diagnosis of secondary open-angle glaucoma due to elevated episcleral venous pressure (EVP) was made. Magnetic resonance venogram revealed thrombosis of transverse and sigmoid sinus on the left side. This is the first case report of secondary open-angle glaucoma due to elevated EVP following thrombosis of transverse and sigmoid sinus.