Fig. 1

The route of the EEEA at the nasal rhinal stage. a: The middle turbinate (MT) and nasal septum (NS). b: The middle turbinate has been lateralized. c: The sphenoid sinus ostium (SSO) is present between the superior turbinate (ST) and nasal septum. d: After resection of the partial nasal septum, the right nasal cavity (RNC) and left nasal cavity (LNC) were linked together