Use of a masseter fascia transposition flap for ventral orbital stabilization after partial inferior orbitectomy in a dog.

A 12-year-old neutered male pit bull crossbreed dog was presented because of a right caudal maxillary swelling. Computed tomographic imaging of the skull and revealed a right maxillary mass with lysis of the medial wall of the right orbit and rostral aspect of the zygomatic bone. A biopsy was done, and histopathology results were consistent with a mixed odontogenic tumor. The mass was resected with a caudal maxillectomy and partial inferior orbitectomy with 1-centimeter lateral margins. A transposition flap of the masseter fascia was performed to stabilize the globe. The cosmetic and functional outcomes were excellent during an in-person clinical examination 2 wk postoperatively and at a follow-up 1 y postoperatively (telephone communication with the owner). Key clinical message: The use of the masseter fascia as a transposition flap after a caudal maxillectomy and partial inferior orbitectomy proved successful for orbital stabilization in a dog.