A 21 years old female patient was admitted to hospital for "menolipsis of 28 weeks,discovery of nasal neoplasm for 2 months,headache for 10 days".check:The left nasal cavity was filled with a red neoplasm extending to the edge of the nasal vestibule,with incrustation on its surface and easy haemorrhage when touched.Sinus CT:the left side of the nasal vestibule,nasal meatus and the whole sets of sinuses were full of soft tissue density with nasal bone absorption,malignant diseases not excluded.MRI:The left side of the nasal vestibule,nasal passages,cribriform roof and frontal sinus were filled with equal T1 and long T2 signal,with obvious tortuous signal of voids of vessel,partially extending into the left orbit,and accompanied with obstructive sinusitis.Postoperative pathologic and immunohistochemical results diagnosed as esthesioneuroblastoma.