A 57-year-old woman had a slow-growing mass affecting the maxillary right posterior gingiva of 2 years’ duration. She denied initial trauma to area and was asymptomatic. Her medical history significant for gastroesophageal reflux disorder attention deficit disorder. Surgical, family, social histories were unremarkable. Medications included ranitidine hydrochloride, dexlansoprazole, dexmethylphe...