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Ⅰ.はじめに
吸収性コラーゲン人工硬膜(DuraGen®, Integra Lifescience, New Jersey, USA)は開頭手術において硬膜補塡材料として使用されており1-4),日本でも2019年7月から使用可能となった.しかし硬膜欠損部が広い場合,DuraGen®に直接硬膜外吊り上げを施すことができないため,術後硬膜外液貯留が問題となることが報告されている.今回われわれは,DuraGen®に対する硬膜外吊り上げ手技を紹介する.
DuraGen®, an absorbable, engineered collagen-based artificial graft was introduced in Japan in September 2019 for cranial, transsphenoidal, and spinal surgeries. In addition to its efficacy and safety profile, owing to sutureless dural repair, DuraGen® is widely accepted by neurosurgeons. Direct tenting with DuraGen® is occasionally required in patients with large dural defects, particularly in cases of tumors adherent to the dura. To overcome this limitation, we introduced a surgical technique for epidural tenting using DuraGen®.
A 78-year-old man with a history of alexia underwent craniotomy for resection of a left temporal lobe metastatic tumor. We completely removed the recurrent tumor, which was strongly adherent to the dura in the middle cranial fossa. A layer of DuraGen® was used as a subdural underlay beneath the autologous dura to close the wide dural defect. To avoid postoperative epidural fluid collection, we retracted the DuraGen® from the epidural aspect and interposed several pieces of muscle, which were sutured on the subdural aspect to ensure that the muscle pieces securely plugged the dural defect. We placed an additional overlay of DuraGen® along the autologous dura. The patient's postoperative course was uneventful without cerebrospinal fluid leakage, tension pneumocephalus, or wound infection. Reoperations for tumor resection, particularly surgical procedures for refractory meningiomas and malignant tumors cause increasing fragility and wide defects of the dura. DuraGen® placement enables sutureless closure and is less time-consuming. Our technique of epidural direct tenting with DuraGen® using muscle pieces sutured on the subdural aspect could be useful in patients with significantly large dural defects and can prevent postoperative epidural fluid collection to ensure complete dural sealing.
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