Correspondence
Immunoglobulin G4–related dacryocystitis
Immunoglobulin G4 (IgG4)–related dacryocystitis is a rare condition characterized by elevated serum IgG4 levels and IgG4-positive lymphoplasmacytic infiltration in the lacrimal sac.1 In the periocular region, IgG4-positive lymphoplasmacyte infiltration commonly occurs in the lacrimal gland, extraocular muscles, orbital soft tissues, and the infraorbital nerve.1 Clinicopathologic characteristics of IgG4-related dacryocystitis are not fully understood. Herein, we report the case of a patient with IgG4-related dacryocystitis.Comprehensive imaging studies of nasolacrimal duct obstruction secondary to maxillary sinus surgery
Nasolacrimal duct obstruction (NLDO) can be caused by injury during maxillary sinus surgery.1–5 Most cases of NLDO are transient, and permanent NLDO rarely occurs.1 Previous studies demonstrated radiological findings of secondary NLDO caused by maxillary sinus surgery.4,5 However, findings from other imaging studies, including dacryoendoscopy and nasal endoscopy, have not yet been comprehensively elucidated in patients with permanent secondary NLDO.
