[Recurrent maxillary sinus pleomorphic gonadoma into myoepithelial carcinoma: a case report].

Summary A 44-year-old woman with left nasal obstruction and facial numbness for 4 months was admitted to hospital. The patient did not have amblyopia, vision loss, runny nose with blood, dizziness ,headache or other discomfort.In 1991 and 2001, the patient were pathologically diagnosed as pleomorphic adenomas.CT of nasal cavity and paranasal sinuses showed that in the left maxillary sinus there was an about 4.4 cm×4.5 cm×4.7 cm large mass soft tissue density, showing expansive growth protruding into the left orbital floor.MRI showed that the lumped short T1 signal was seen in the left maxillary sinus and the linear long T1 signal was seen in the left nasal cavity, and the liquid accumulation signal foci could be seen in the left maxillary sinus.Postoperative pathological findings: （left maxillary sinus mass） Combining morphology, immunohistochemical results and medical history, consistent with pleomorphic adenoma carcinogenesis （cancer in pleomorphic adenoma）, carcinogenesis type is myoepithelial carcinoma.