S2422 A Lichen for the Esophagus: A Rare Case of Esophageal Lichen Planus

Abstract

Introduction: Lichen planus is an inflammatory condition of the skin and mucosal membranes. Sites of disease are variable and esophageal involvement is uncommon. We highlight a case of esophageal lichen planus masquerading as eosinophilic esophagitis. Case Description/Methods: A 59-year-old female with a past medical history of hypothyroidism status post thyroidectomy presents with progressive dysphagia and odynophagia to solids for 3 years. Symptoms initially began after thyroidectomy. Evaluation by ENT was notable for inflammatory changes of the oropharynx for which PPI trial was given for clinical features of silent reflux. Despite a 2-month course of therapy, symptoms persisted. Videofluoroscopic swallow study was unremarkable without evidence of aspiration or penetration. Subsequent EGD was notable for exudates, linear furrowing, and rings to suggest the diagnosis of eosinophilic esophagitis. Esophageal biopsy pathology features, however, showed band-like lymphocytic infiltration of the lamina propria and civatte bodies within the squamous epithelium consistent with esophageal lichen planus. Unfortunately, the patient was lost to follow up and subsequent treatment was unable to be initiated. Discussion: Esophageal lichen planus is an exceedingly rare entity with less than 100 documented case reports. It is likely underdiagnosed given that it can mimic other esophageal entities, such as eosinophilic esophagitis as seen in our patient. As such, histologic examination is necessary to identify key features of esophageal lichen planus which include lymphocytic infiltrates of the lamina propria as well as civatte bodies, which represent necrotic keratinocytes. Esophageal lichen planus has a tendency to be chronic and require topical or systemic therapy with steroids. Stricture development will typically require dilatation. Clinicians should consider esophageal lichen planus as part of their differential for dysphagia especially given the potential for malignant transformation to squamous cell carcinoma, which has been reported in 1-2% of cases.