Computed Tomographic Features of a Histopathologically Confirmed Nasal Dermoid Sinus in a Dog

A 1.5-year-old English Springer Spaniel presented with a firm, non-painful, dorsal nasal swelling of gradual increasing size. Rostral to the swelling, a small round pit at the mucocutaneous junction of the caudodorsal midline nasal planum was noted. Computed tomography (CT) identified a focal, midline to left-sided swelling with a central cavity and a thin, linear, midline tube running in the subcutaneous space to the small pit at the mucocutaneous junction. The swelling was positioned directly dorsal to and protruding into a nasal suture widening. Surgical excision was performed. Histopathology confirmed a nasal dermoid sinus. Surgical excision was curative.