Absent enhancement interface sign: a novel radiologic indicator of intrasellar arachnoid cysts.

PURPOSE: Intrasellar arachnoid cysts are extremely rare, and their differentiation from other cystic lesions can be challenging because of their similar imaging characteristics.

METHODS

This study aimed to describe the imaging characteristics observed in five patients and correlate them with developmental and growth mechanisms.

RESULTS

These cysts are characterized by the lack of contrast enhancement in their walls and posterior displacement of the pituitary gland. As a result, no enhancing tissue is present at the anterior portion of the sella where it interfaces with the sphenoid sinus.

CONCLUSION

We believe that this sign will lead to more accurate diagnosis and improve surgical planning.