eng Science and Education Publishing Neuro Ophthalmology & Visual Neuroscience 2572-7281 2021-03-28 6 1 1 3 10.12691/novn-6-1-1 NOVN2021611 article Kumar S 1 Mehra R 1 Chauhan N 2 Department of Otolaryngology and Head Neck Surgery, Dr. Rajendra Prashad Government Medical College Tanda, Kangra H.P. India Department of Radiodiagnosis, Dr. Rajendra Prashad Government Medical College Tanda, Kangra H.P. India Mucocele of para-nasal sinus is a rare entity resulting from chronic accumulation of mucoid secretion, leading to progressive thinning of sinus bony wall. We are presenting a case report of a middle age female patient with sphenoid mucocele causing sudden third cranial nerve palsy with pupil sparing. She was managed by urgent endoscopic marsupialzation. http://pubs.sciepub.com/novn/6/1/1/novn-6-1-1.pdf Sphenoid mucocele third nerve palsy endoscopic sinus surgery