caa a22 4500 477106714 CHVBK 20180405111555.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF01411474 doi (NATIONALLICENCE)springer-10.1007/BF01411474 Cystic acoustic neurinomas: Studies of 14 cases [Elektronische Daten] [S. Kameyama, R. Tanaka, T. Kawaguchi, M. Fukuda, K. Oyanagi] Summary: Cystic acoustic neurinomas (ANs) are less frequent and are different from solid ANs in clinical and radiological features. We had 14 cystic ANs (13.5% of 104 cases) in the last 17 years. Computerized tomographic or magnetic resonance images allowed for the classification of these cystic ANs into three types: Type A being large single cysts with a thin tumourous wall (7 cases); type B single cysts with a thick tumourous wall (3 cases); type C multicystic (4 cases). Half of the cystic ANs were not accompanied by enlargement of the internal auditory canal, despite the largeness of the cysts. The mean size of the tumours was 29 mm in diameter. Type A cysts had a shorter clinical history than types B and C. One patient had intact hearing. In five cases, an atypical initial symptom such as facial pain, dysgeusia, facial palsy, unsteadiness or vertigo presented. The trigeminal nerve was involved in 12 cases, the facial nerve in nine. The characteristic features of cystic ANs are largeness of the tumour, a short clinical history, an atypical initial symptom, facial nerve involvement, and/or no enlargement of the internal auditory canal. In addition, the histological features are a lobular growth pattern, high nuclear atypia, and numerous macro phages. Springer-Verlag, 1996 Acoustic neurinoma nationallicence computerized tomography nationallicence cystic tumour nationallicence magnetic resonance imaging nationallicence Kameyama S. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut Tanaka R. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut Kawaguchi T. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut Fukuda M. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut Oyanagi K. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut Acta Neurochirurgica Springer-Verlag 138/6(1996-06-01), 695-699 0001-6268 138:6<695 1996 138 701 https://doi.org/10.1007/BF01411474 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01411474 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kameyama S. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut NATIONALLICENCE 700 1- Tanaka R. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut NATIONALLICENCE 700 1- Kawaguchi T. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut NATIONALLICENCE 700 1- Fukuda M. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut NATIONALLICENCE 700 1- Oyanagi K. Department of Neurosurgery and Department of Brain Materials Research, Brain Research Institute, Niigata University, Niigata, Japan aut NATIONALLICENCE 773 0- Acta Neurochirurgica Springer-Verlag 138/6(1996-06-01), 695-699 0001-6268 138:6<695 1996 138 701 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer