A Rare Case of Esophageal Leukoplakia: A Potential Precursor to Esophageal Malignancy.

Esophageal leukoplakia or epidermoid metaplasia is a rare lesion resembling the commonly found oral leukoplakia. When found, it is typically seen incidentally on endoscopy as a white plaque but rarely it may present as a globus sensation. Histologically, it is seen as epidermal metaplasia with orthokeratosis, closely resembling the skin. Although rare, esophageal leukoplakia is precancerous and may pose a serious threat. We present a unique case of a 61-year-old male with a history of COPD, tobacco, and alcohol dependence presenting with a six-month history of nausea and emesis resulting in poor oral intake despite having an appetite. The patient also reported weight loss. Considering his risk factors for esophageal carcinoma and alarm symptoms, an upper endoscopy was performed that revealed localized white, plaque-like mucosal changes characterized by altered texture in the lower third of the esophagus at 40cm. Biopsy results showed squamous epithelium with orthokeratosis and a prominent granular cell layer. These findings were consistent with esophageal epidermoid metaplasia. The lesion was ablated using argon plasma coagulation and radiofrequency ablation on subsequent endoscopy. The patient reported continued resolution of symptoms with each treatment session. Esophageal leukoplakia may increase the risk for squamous cell carcinoma of the esophagus and should be followed closely. Guidelines on surveillance are yet to be established given the rarity of the disease.