東口 彩映子

OBJECTIVE: Knowledge of the location of tumor-feeding arteries is necessary for the safe surgery of intracranial meningiomas. Hence, this retrospective study aimed to comprehensively analyze the distribution of tumor-feeding arteries. METHODS: Patients who underwent intracranial meningioma surgery at our institution between 2015 and 2023 were included in this study. The tumor attachment sites and tumor-feeding arteries were evaluated based on the results of preoperative examinations. The tumor attachment sites were classified as non-skull bases (convexity, parasagittal, and falx) or skull bases (anterior skull base, sphenoid ridge, sphenopetroclival, petrous, tentorial, cerebellar convexity, and foramen magnum). These tumors were further subdivided according to their attachment areas. RESULTS: Among the 180 patients included, the tumor-feeding arteries were identified in 177 patients (98.3%). In 67 patients with non-skull base meningiomas, the middle meningeal artery primarily functioned as a tumor-feeding artery in the anterior and middle regions (78 of 108 feeding arteries, 72.2%), while the extracranial artery served as a tumor-feeding artery in the posterior region (20 of 37 feeding arteries, 54.1%). Conversely, skull base meningiomas exhibited a higher frequency of having tumor-feeding arteries derived from the internal carotid artery (132 of 278 feeding arteries; 47.5%); these tumor-feeding arteries are often found at the deepest part of the surgical field during tumor resection and require careful intraoperative handling. CONCLUSIONS: Tumor-feeding arteries originate from different dural arteries depending on the tumor attachment site. These findings could help enhance surgical safety, especially in patients with meningiomas who have not undergone preoperative angiography.

BACKGROUND: In intraventricular surgery using a flexible endoscope, the lesion is usually aspirated via the working channel. However, the surgical view during aspiration is extremely poor because the objective lens is located adjacent to the working channel. METHOD: To address this issue, we developed a novel surgical procedure using an angiographic catheter. In this procedure, the catheter is inserted into the working channel, and the lesion is aspirated through the catheter. Besides, continuous intraventricular irrigation is performed via the gap between the catheter and the working channel. CONCLUSION: This procedure maintains a clear view during surgery and reduces complications.

Ischemia-induced postoperative scalp necrosis in the superficial temporal artery (STA) region is known to occur after STA-middle cerebral artery anastomoses. However, no reports have evaluated the risk of postoperative scalp necrosis in the occipital artery (OA) region. This study examined the surgical procedures that pose a risk for postoperative scalp necrosis in the OA region following posterior cranial fossa surgery. Patients who underwent initial posterior fossa craniotomy at our institution from 2015 to 2022 were included. Clinical information was collected using medical records. Regarding surgical procedures, we evaluated the incision design and whether a supramuscular scalp flap was prepared. The supramuscular scalp flap was defined as a scalp flap dissected from the sternocleidomastoid and/or splenius capitis muscles. A total of 392 patients were included. Postoperative scalp necrosis occurred in 19 patients (4.8%). There were 296 patients with supramuscular scalp flaps, and supramuscular scalp flaps prepared in all 19 patients with postoperative necrosis. Comparing incision designs among patients with supramuscular scalp flap, a hockey stick-shaped scalp incision caused postoperative necrosis in 14 of 73 patients (19.1%), and the odds of postoperative scalp necrosis were higher with the hockey stick shape than with the retro-auricular C shape (adjusted odds ratio: 12.2, 95% confidence interval: 3.86-38.3, p = 0.00002). In all the cases, ischemia was considered to be the cause of postoperative necrosis. The incidence of postoperative necrosis is particularly high when a hockey stick-shaped scalp incision is combined with a supramuscular scalp flap.