Endoscopic brain surgery represents a paradigm shift in neurosurgical operative care, moving from traditional open cranial exposures to minimally disruptive corridors. By delivering high-intensity illumination and magnified visualization directly to deep-seated intracranial structures, neurosurgeons can operate around critical neurovascular anatomy without broad brain retraction. The core clinical goals are total or subtotal surgical resection of intracranial pathology, restoration of physiological cerebrospinal fluid dynamics, relief of cranial nerve compression, and preservation of neurological and endocrine function.

The patient is placed under general endotracheal anesthesia and secured in a rigid skull fixation frame. Image-guided neuronavigation systems are calibrated using pre-operative MRI or CT scans to provide millimeter-precision tracking. For endonasal procedures, the nasal mucosa is decongested with topical epinephrine solution. A neurosurgeon and an otolaryngologist (ENT surgeon) frequently work together using a binasal four-hands technique. Standard rigid endoscopes (typically 0-degree and 30-degree optics) are introduced through the nostrils. The sphenoid ostia are identified and enlarged, and the posterior nasal septum is removed to open the sphenoid sinus cavity. The thin bony floor of the sella turcica or clivus is opened using high-speed diamond burs and micro-punches. The dura mater is carefully incised, exposing the tumor. Micro-dissectors, suction cannulas, and curettes are utilized to resect the tumor piecemeal while preserving adjacent structures such as the optic chiasm, pituitary stalk, and internal carotid arteries. Following resection, hemostasis is verified. Reconstruction of the skull base defect is performed using a multi-layer technique, often incorporating synthetic dural substitutes, abdominal fat grafts, fascia lata, or a vascularized nasoseptal flap held in place with tissue glue and absorbable packing.

Evidence-based clinical benefits of endoscopic brain surgery compared to traditional open craniotomy include:

• Elimination of external cranial facial incisions when using transnasal corridors, eliminating visible surgical scarring.
• Minimized brain retraction, reducing the risk of retraction-induced cerebral ischemia, edema, and localized tissue trauma.
• Enhanced panoramic visualization of deep skull base structures and neurovascular interspaces, facilitating targeted lesion removal.
• Reduced operative blood loss and lower systemic inflammatory response compared to formal open craniotomies.
• Shorter post-operative hospital stays, with average inpatient admission ranging from two to four days.
• Faster functional recovery timelines and accelerated return to daily activities.

Post-operative recovery unfolds across distinct clinical phases. During the initial 24 to 72 hours, inpatient care focuses on neurological status verification, monitoring for diabetes insipidus, tracking serum sodium levels, and confirming the absence of cerebrospinal fluid leaks. During weeks one through four at home, patients must observe strict precautions: avoiding nose blowing, physical straining, heavy lifting over ten pounds, and bending forward at the waist to prevent surges in intracranial pressure. Nasal congestion and crusting are normal following endonasal procedures and are routinely managed with saline nasal sprays. Full tissue healing at the skull base and resolution of fatigue typically require six to eight weeks, at which point structural neuroimaging is repeated.

Endoscopic brain surgery is clinically indicated for a broad range of deep-seated intracranial conditions, including:

• Pituitary adenomas (functioning and non-functioning)
• Rathke cleft cysts
• Craniopharyngiomas
• Skull base meningiomas (tuberculum sellae, olfactory groove, and sphenoid wing)
• Chordomas and chondrosarcomas of the clivus
• Obstructive hydrocephalus (via endoscopic third ventriculostomy)
• Colloid cysts of the third ventricle
• Arachnoid cysts and intraventricular lesions
• Cerebrospinal fluid (CSF) rhinorrhea and skull base defect repair

Pre-procedure preparation involves a detailed neurosurgical evaluation, volumetric brain MRI with dynamic gadolinium enhancement, and high-resolution skull base CT scans for neuronavigation. Patients with sellar or parasellar tumors undergo baseline endocrinological lab testing (including morning cortisol, ACTH, TSH, free T4, prolactin, GH, IGF-1, LH, FSH, and testosterone/estrogen) alongside visual field testing by an ophthalmologist. Medical optimization includes stopping all non-steroidal anti-inflammatory drugs (NSAIDs), aspirin, and anticoagulants 7 to 10 days before surgery under appropriate medical supervision. Pre-operative nasal irrigation protocols or ENT examinations are conducted to ensure the nasal passages are free from active sinusitis.

Complications of endoscopic brain surgery are classified by severity. Common, self-limiting risks include temporary nasal congestion, anosmia or hyposmia (loss or diminished sense of smell), transient headache, and mild nasal epistaxis. Uncommon complications include persistent cerebrospinal fluid (CSF) leaks (occurring in 2% to 5% of cases depending on defect size), transient or permanent diabetes insipidus due to pituitary stalk manipulation, anterior pituitary hormone deficiencies requiring replacement therapy, and localized sinusitis. Rare but serious risks include severe arterial injury (such as laceration of the internal carotid artery), intracranial hemorrhage, post-operative meningitis, visual field deficits, cranial nerve palsies, stroke, and risk of mortality.

The patient journey for endoscopic brain surgery begins with a comprehensive diagnostic workup including high-resolution volumetric magnetic resonance imaging, fine-cut computed tomography for intraoperative neuronavigation planning, and multi-system medical evaluations. On the day of surgery, general anesthesia is administered, and real-time image guidance is calibrated. The surgical team navigates through the nasal cavity or a small cranial entry point to perform tumor resection or ventricular fenestration. Following surgery, patients spend 24 to 48 hours in a specialized neurosurgical intensive care unit for frequent neurological checks, endocrine monitoring, and fluid balance management. Hospital discharge typically occurs within two to four days, followed by a structured outpatient recovery phase lasting four to eight weeks featuring serial imaging and multidisciplinary follow-up appointments.