Ferrous Sulfate-Induced Esophageal Injury Leading to Esophagitis Dissecans Superficialis

: Medication-induced esophagitis is a well-known but relatively rare clinical diagnosis, most common in patients with preexisting esophageal dysmotility, obstruction, or altered anatomy. Esophagitis dissecans superficialis (EDS) is a rare endoscopic finding characterized by sloughing of large fragments of the esophageal mucosal lining. The causes of EDS include prior trauma, heavy smoking history, ingestion of alcoholic and hot beverages, and immunosuppression. We present a unique case of EDS secondary to ferrous sulfate-induced pill esophagitis. The patient was a 94-year-old male who presented with dysphagia to solids, odynophagia, and weight loss. Esophagogastroduodenoscopy (EGD) revealed EDS. Biopsies demonstrated vacuolar degeneration at the midlevel of the epithelium with overlying hyperkeratosis and parakeratosis, with noted black/brown pigment present at the level of the split in the epithelium. The patient was started on a liquid diet with no oral administration of pills. EGD was repeated and showed a significant improvement in esophageal mucosa and resolution of strictures. Although medication-induced esophagitis is not classically associated with EDS, specific circumstances that are associated with pill esophagitis may lead to progression to EDS. In the case of our patient, prolonged contact of ferrous sulfate to the esophageal mucosa is thought be a result of an enlarged left atrium and pulmonary arteries secondary to longstanding coronary artery disease and an enlarged left bronchus secondary to chronic obstructive pulmonary disease and right pneumonectomy. These anatomical changes likely led to an extended duration of contact and are believed to have led to erosion of the superficial esophageal mucosa, eventually progressing to EDS.