title: Pseudosarcomatous changes in antrochoanal polyps.
mesh_terms: D001706:Biopsy; D003937:Diagnosis, Differential; D006801:Humans; D008443:Maxillary Sinus; D009298:Nasal Polyps / Q000175:diagnosis; D010255:Paranasal Sinus Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D011127:Polyps / Q000473:pathology / Q000601:surgery; D012509:Sarcoma / Q000175:diagnosis