¹Istanbul University-Cerrahpaşa, Faculty of Veterinary, Surgery Department, TR-34315 İstanbul - TÜRKİYE
²Istanbul University-Cerrahpaşa, Faculty of Veterinary, Pathology Department, TR-34555 İstanbul - TÜRKİYE DOI : 10.9775/kvfd.2023.29127 Feline progressive histiocytosis is a rare proliferative disorder manifested by solitary or multiple cutaneous nodules and papules with potential late distant metastasis. This case study presents clinical, diagnostic imaging, and histopathologic findings and therapeutic approach to progressive ocular histiocytosis detected in a 1.5-year-old male Domestic Shorthair cat with a complaint of a painless firm mass on the left lower eyelid. Magnetic resonance imaging (MRI) of the orbit revealed a tumoral lesion expanding from the left lower eyelid into the intraorbital space, translocating the bulbus from ventrolateral to dorsomedial. The computed tomography (CT) visualized a destructive lesion on the infraorbital edge, which was histopathologically confirmed to be progressive nodular histiocytosis. Keywords : Cat, Eye, Computed tomography, Magnetic resonance imaging, Progressive histiocytosis