Esophageal verruciform xanthoma following radiotherapy.

Verruciform xanthoma (VX) is an uncommon benign lesion of unclear etiology which has only been reported twice before in the esophagus. We describe a 70-year-old male who presented an exophytic esophageal lesion incidentally found upon endoscopy 2.7 years following radiation therapy for unresectable squamous cell carcinoma of the tracheal carina. Histologically, the lesion showed a papillary surface change with numerous foamy histiocytes within the lamina propia papillae. Xanthoma cells were strongly positive for vimentin and CD68 (KP1). Polymerase chain reaction did not demonstrate human papillomavirus (HPV) infection. Our results indicate that esophageal VX is not an HPV-induced lesion and suggest a causal relationship between VX and radiotherapy, as previously noted. Histological differential diagnosis is discussed and emphasis is placed on obtaining adequate biopsy material for accurate diagnosis.