Transconjunctival Orbitotomy as Surgical Management of an Orbital Lipoma in a Dog.

Transconjunctival orbitotomy enables globe-sparing removal of benign orbital lipomas confirmed via CT and histopathology.

This case report describes the successful surgical management of a retrobulbar orbital lipoma in a 14-year-old female Border Collie presenting with chronic exophthalmos. Despite prolonged ocular surface exposure, the patient retained bilateral vision at the time of presentation. Diagnostic workup included ophthalmic examination, computed tomography (CT), and cytological evaluation. CT imaging identified a retrobulbar mass with adipose tissue-compatible density, and cytology provided supportive pre-operative evidence for a lipoma diagnosis. Surgical intervention was carried out via anterior transconjunctival (subconjunctival) orbitotomy, a minimally invasive approach that allowed complete mass removal while preserving globe integrity and visual function. Histopathological examination confirmed the diagnosis of an orbital lipoma. The authors emphasize that orbital lipomas, though rare in dogs, should be considered in the differential diagnosis of retrobulbar masses, particularly when CT reveals fat-dense lesions. Pre-operative cytology is highlighted as a useful screening tool, while histopathology remains the diagnostic gold standard. The transconjunctival orbitotomy approach is presented as a viable, vision-sparing technique for selected benign orbital lesions, offering functional and cosmetic advantages over more aggressive surgical methods. This case underscores the clinical value of advanced imaging in surgical planning for orbital disease in small animal patients.

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