Original article： Anterior and middle skull base reconstruction after tumor resection

Background Surgical management of skull base tumors is still challenging today due to its sophisticated operation procedure. Surgeons who specialize in skull base surgery are making endeavor to promote the outcome of patients with skull base tumor. A reliable skull base reconstruction after tumor resection is of paramount importance in avoiding life-threatening complications, such as cerebrospinal fluid leakage and intracranial infection. This study aimed at investigating the indication, operation approach and operation technique of anterior and middle skull base reconstruction. Methods A retrospective analysis was carried out on 44 patients who underwent anterior and middle skull base reconstruction in the Department of Neurosurgery at Beijing Tiantan Hospital between March 2005 and March 2008. Different surgical approaches were selected according to the different regions involved by the tumor. Microsurgery was carried out for tumor resection and combined endoscopic surgery was performed in some cases. According to the different locations and sizes of various defects after tumor resection, an individualized skull base soft tissue reconstruction was carried out for each case with artificial materials, pedicled flaps, free autologous tissue, and free vascularized muscle flaps, separately. A skull base bone reconstruction was carried out in some cases simultaneously. Results Soft tissue reconstruction was performed in all 44 cases with a fascia lata repair in 9 cases, a free vascularized muscle flap in 1 case, a pedicled muscle flap in 14 cases, and a pedicled periosteal flap in 20 cases. Skull base bone reconstruction was performed on 10 cases simultaneously. The materials for bone reconstruction included titanium mesh, free autogenous bone, and a Medpor implant. The result of skull base reconstruction was satisfactory in all patients. Postoperative early-stage complications occurred in 10 cases with full recovery after conventional treatment. Conclusions The specific characteristics of skull base defects in various regions require different reconstruction materials and methods. The individualized reconstruction based on different skull base defects can achieve satisfactory results.

Primary diffuse intraosseous meningioma

rimary intraosseous meningiomas are a subset of primary extradural meningiomas that arise in bones,and represent about two thirds of primary extradural meningiomas. Here we present a case of primary intraosseous meningioma with diffuse and symmetrical invasion of skull and scalp, which was preoperatively diagnosed as fibrous dysplasia. We described the clinical and radiological characteristics, discussed the potential pathogenesis of the diffuse lesion, and presented surgical management.