An atypical medial canthal mass: a case of lacrimal sac inverted papilloma with literature review

Background Lacrimal sac localization of an Inverted Papilloma is extremely rare and no risk factors are reported in literature. History A chemical trauma was followed by a painless, growing mass in the medial canthal area associated with epiphora. Findings Rhinoendoscopy, Computed Tomography and Magnetic Resonance showed a well-defined mass in left lacrimal fossa extended to the nasolacrimal duct. Treatment An endoscopic resection and a dacryocystorhinostomy were performed. Conclusion The aim of the present study is to show an atypical presentation of a well-known tumor along with a suspicious risk factor and to lead otolaryngologists to consider an inverted papilloma of the lacrimal system among lesions causing lateral nasal swelling.