FIG. 1.

Preoperative MRI (A) displaying the recurrent AcCC in the skull base region, extending from the right sphenoid sinus to the nasal cavity and into the right middle cranial fossa. Histological examination (B) with hematoxylin and eosin stain confirming typical AcCC with round nuclei and finely vacuolated cytoplasm. Original magnification ×400.