A 14-year-old spayed female dog of mixed breeding had a 3-week history
of regurgitation of food occasionally mixed with blood. An esophagram
revealed a mass in the caudal portion of the esophagus. The mass was
partially removed through esophagoscopy Evaluation of light microscopy
, immunoperoxidase technique, and electron microscopy was consistent w
ith an esophageal plasmacytoma. Surgical of the esophageal plasmacytom
a was performed. Dogs with esophageal plasmacytoma appear to have a go
od prognosis.