Abstract Introduction Orbital cellulitis is a severe, life-threatening infection of the orbit and its contents posterior to the septum. Case Report A 41-year-old admitted to hospital under ENT with complete proptosis on left eye and raising intra ocular pressure (IOP) - 26mmHg. He initially presented to Ophthalmology with worsening left eyelid swelling, pain, reduced visual acuity (VA) from 6/18 to 6/12 for the past 4 weeks. This was associated with restricted EOM, proptosis of left eye but intact colour vision and left sided headaches refractory to topical management. His ENT exam including a flexible nasoendoscopy was normal. The CT Sinuses showed poorly enhancing retro orbital poorly enhancing mass. The differential diagnosis is wide and further assessment with MRI and tissue biopsy highly advised. He subsequently underwent MRI Head and Orbit with contrast: Appearances are suggestive of left periorbital cellulitis with an intraconal abscess. He was started on intravenous (IV) antibiotics. His IOP had now increase to 35mmHg for which he underwent emergency lateral canthotomy and cantholysis (LCC) in clinic. This successfully reduced the IOP to 21mmHg and he subsequently had formal drainage of the abscess. He made significant recovery and was discharged home a week after the operation. He went on to have repeat MRI- which showed almost complete resolution of the disease process. He was reviewed 4weeks postoperatively, his VA returned to 6/7.5 unaided 4 weeks but continued to have proptosis in that eye for which he is being followed up.