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"Bella", an 11-year-old domestic shorthair cat, was suffered from chronic sinus infections, so when her nasal congestion worsened, her owner thought it was a flare-up of the infection. Then changes in her facial appearance were noted and she was brought in for an examination. The nose appeared noticeably wider between the eyes. There was a swelling in the forehead area and also below the right eye. In addition, the third eyelid or nictitans was protruding. Bella was scheduled for skull radiographs.

On the left is a lateral view of the skull of a normal cat. On the right is Bella's skull. The arrows outline a large area of bone destruction in the nasal and frontal sinus areas.

On the left is a ventro-dorsal (bottom-to-top) view of a normal cat. On the right is Bella's skull. On the enlarged view, the arrows outline a portion of the tumor that has destroyed a portion of the bony arch that forms part of the orbit of the eye.