Visualized ethmoid roof cerebrospinal fluid leak during frontal balloon sinuplasty.

Balloon sinus dilation (BSD) is generally accepted as a safe alternative to traditional sinus surgery. It is a unique technique designed to potentially minimize complications associated with traditional functional endoscopic sinus surgery (FESS). We present a case in which a 65-year-old man experienced a cerebrospinal fluid (CSF) leak in the ethmoid roof that was visualized instantly after balloon dilation in a revision sinus surgery.