The surgeons at MUSC Health were some of the first in the country to perform endoscopic skull base surgery. These cases represent close collaborations between our neurosurgeons and our rhinologists (sinus surgeons). Endoscopic approaches have demonstrated quicker recover with fewer complications than traditional “open” approaches through incisions while still achieving similar success rates for treatment of tumors. These cases are typically started by the rhinologist who opens the sinus cavities widely. The portion of tumor at the skull base is then removed by having our neurosurgeon work through one nostril, while the rhinologist works through the other. This “two surgeon” approach provides the advantage of having two brains and four hands working on each case. Our team has written over 40 articles describing surgical techniques and results using endoscopic, minimally invasive approaches to skull base problems. These cases can be broken up into a variety of types.
When there is a defect in the bone of the skull base and dura, then cerebrospinal fluid (CSF) can leak into the nose. If the lining of the brain or a small portion of the brain herniates into nose, this is called an encephalocele. These conditions increase the risk of meningitis or other infections of the brain. These leaks can occur spontaneously, after trauma or prior surgery or in rare cases can be congenital. Endoscopic repair is successful in reducing this risk of meningitis and most leaks can be repaired without any incisions. Our group has published over 25 articles on techniques for treating CSF leaks and is one of the leading centers in the US for these conditions.
The most common soft tissue tumor in the sinuses is inverted papilloma. Other benign tumors include juvenile nasopharyngeal angiofibroma (JNA), schwannoma, hemangioma, adenoma or squamous papilloma. Benign bony tumors are often osteomas or ossifying fibromas. These benign tumors can usually be removed endoscopically. Extensive tumors may require an incision along the brow, but this is uncommon.
Malignant sinus tumors are fortunately quite rare. There are a wide spectrum including esthesioneuroblastoma (olfactory neuroblastoma), squamous cell carcinoma, adenocarcinoma, adenoid cystic carcinoma, melanoma, nasopharyngeal carcinoma and neuroendocrine tumors. Treatment for these tumors usually begins with aggressive surgical resection. This can often be done endoscopically. Postoperative treatment may involve radiation therapy or chemotherapy, depending upon the extent of the tumor.
Most pituitary tumors are benign and are removed when they become large enough to impair vision, cause headaches or affect nearby structures. The endoscopic approach provides superior visualization and outcomes are equivalent or better than older approaches using microscopic techniques. Other tumors secrete hormones and may need to be removed if medical treatments fail. We work closely with our endocrinologists in the medical management of these pituitary tumors. Other lesions in the region of the pituitary gland include craniopharyngiomas and Rathke’s cysts and these can also be treated endoscopically.
Other skull base tumors that can be removed endoscopically include meningiomas, chordomas, chondrosarcomas and cholesterol granulomas. Open approaches to these challenging areas often require brain retraction or operating through otherwise normal structures. The endoscopic trans-nasal approach permits surgeons to reach these critical areas with minimal disruption of the brain and other vital structures.
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