Vérillaud B, Savatovsky J, El Bakkouri W, Williams M, Ayache D
Fondation Adolphe de Rothschild, Service d'ORL et de Chirurgie Cervico-Faciale, 25 rue Manin, 75019 Paris, France.
Rev Laryngol Otol Rhinol (Bord). 2010;131(4-5):281-4.
Arachnoid granulations play a role in CSF drainage. They are primarily located adjacent to cerebral venous sinuses. They may arise on a bony surface causing progressive bony erosion. We report two cases of arachnoid granulations eroding the posterior wall of the temporal bone. The aim of this paper was to illustrate the clinical presentation, and the imaging findings of arachnoid granulation of the posterior wall of the temporal bone. They remain asymptomatic in most cases, but they might cause a communication between the subarachnoid space and mastoid air cells, increasing the risk of bacterial meningitis, subdural empyema, and other intracranial infections. Differential diagnoses are also described, including endolymphatic sac tumours.
蛛网膜颗粒在脑脊液引流中起作用。它们主要位于大脑静脉窦附近。它们可能出现在骨表面，导致进行性骨质侵蚀。我们报告了两例蛛网膜颗粒侵蚀颞骨后壁的病例。本文的目的是阐述颞骨后壁蛛网膜颗粒的临床表现及影像学表现。大多数情况下它们无症状，但可能导致蛛网膜下腔与乳突气房相通，增加细菌性脑膜炎、硬膜下积脓及其他颅内感染的风险。还描述了鉴别诊断，包括内淋巴囊肿瘤。
