The brain is separated from the sinus cavities by the thin bones of the skull base. When there is a breach or thinning of the skull base then some patients may experience clear fluid dripping from the nose indicating a cerebrospinal fluid leak. Other patients may have a herniation of neural tissue into the sinus cavities called an encephalocele. Patients with these conditions are at risk for meningitis. Surgical repair is recommended and can often be performed entirely through the nose without any facial or external incisions. Patients can often return home the day after surgery.