Abstract
An arachnoid cyst arising within the internal auditory canal, or within the cerebellopontine angle and subsequently extending into the internal meatus and enlarging it, is a rare occurrence. Nevertheless, the neurootologist and the neurosurgeon have an interest in its existence because its clinical manifestations are identical with the ones produced by a schwannoma, involving overwhelmingly the cochleovestibular nerve in that region. An equally rare observation in that location is the presence of ectopic neuroglial tissue. The two can occur independently or in combination. Examples of such lesions are presented, and their possible pathogenesis is discussed.
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- BATTEN E. H. The origin of the acoustic ganglion in the sheep. J Embryol Exp Morphol. 1958 Dec;6(4):597–615. [PubMed] [Google Scholar]
- BENGOCHEA F. G., BLANCO F. L. Arachnoidal cysts of the cerebellopontine angle. J Neurosurg. 1955 Jan;12(1):66–71. doi: 10.3171/jns.1955.12.1.0066. [DOI] [PubMed] [Google Scholar]
- Babin R. W., Fratkin J. D., Cancilla P. A. Hamartomas of the cerebellopontine angle and internal auditory canal: report of two cases. Arch Otolaryngol. 1980 Aug;106(8):500–502. doi: 10.1001/archotol.1980.00790320052013. [DOI] [PubMed] [Google Scholar]
- Bridger M. W., Farkashidy J. The distribution of neuroglia and schwann cells in the 8th nerve of man. J Laryngol Otol. 1980 Dec;94(12):1353–1362. doi: 10.1017/s0022215100090186. [DOI] [PubMed] [Google Scholar]
- Brooks M. L., Mayer D. P., Sataloff R. T., Myers D. L., Spiegel J. R., Ruiz S. Intracanalicular arachnoid cyst mimicking acoustic neuroma: CT and MRI. Comput Med Imaging Graph. 1992 Jul-Aug;16(4):283–285. doi: 10.1016/0895-6111(92)90031-4. [DOI] [PubMed] [Google Scholar]
- COOPER I. S., KERNOHAN J. W. Heterotopic glial nests in the subarachnoid space; histopathologic characteristics, mode of origin and relation to meningeal gliomas. J Neuropathol Exp Neurol. 1951 Jan;10(1):16–29. doi: 10.1097/00005072-195110010-00002. [DOI] [PubMed] [Google Scholar]
- Chandross R. J., Adams J. B., Bear R. S. Discontinuous transition of myelin structure at the junction between central and peripheral components of the eighth cranial nerve, as disclosed by X-ray diffraction. J Comp Neurol. 1978 Jan 1;177(1):11–15. doi: 10.1002/cne.901770103. [DOI] [PubMed] [Google Scholar]
- D'Amico-Martel A., Noden D. M. Contributions of placodal and neural crest cells to avian cranial peripheral ganglia. Am J Anat. 1983 Apr;166(4):445–468. doi: 10.1002/aja.1001660406. [DOI] [PubMed] [Google Scholar]
- Feldman B. A., Schwartz R. H., Chandra R., Anderson K. Heterotopic brain tissue simulating a neonatal tonsil. Clin Pediatr (Phila) 1982 Jul;21(7):428–430. doi: 10.1177/000992288202100708. [DOI] [PubMed] [Google Scholar]
- Fraher J. P., Delanty F. J. The development of the central-peripheral transitional zone of the rat cochlear nerve. A light microscopic study. J Anat. 1987 Dec;155:109–118. [PMC free article] [PubMed] [Google Scholar]
- GARDNER W. J., McCORMACK L. J., DOHN D. F. Embryonal atresia of the fourth ventricle. The cause of "arachnoid cyst" of the cerebellopontine angle. J Neurosurg. 1960 Mar;17:226–237. doi: 10.3171/jns.1960.17.2.0226. [DOI] [PubMed] [Google Scholar]
- Gomez M. R., Yanagihara T., MacCarty C. S. Arachnoid cyst of the cerebellopontine angle and infantile spastic hemiplegia. Case report. J Neurosurg. 1968 Jul;29(1):87–90. doi: 10.3171/jns.1968.29.1.0087. [DOI] [PubMed] [Google Scholar]
- Gulya A. J., Glasscock M. E., 3rd, Pensak M. L. Neural choristoma of the middle ear. Otolaryngol Head Neck Surg. 1987 Jul;97(1):52–56. doi: 10.1177/019459988709700109. [DOI] [PubMed] [Google Scholar]
- Helms J., Steinbach E. Ungewöhnliche Befunde bei Operationen am inneren Gehörgang. HNO. 1975 May;23(5):156–159. [PubMed] [Google Scholar]
- Ho K. L. Concurrence of ganglionic hamartoma and heterotopic neuroglial tissue in the cerebellopontine angle. Arch Pathol Lab Med. 1981 Aug;105(8):438–439. [PubMed] [Google Scholar]
- Ibekwe A. O., Ikerionwu S. E. Heterotopic brain tissue in the palate. J Laryngol Otol. 1982 Dec;96(12):1155–1158. doi: 10.1017/s0022215100093634. [DOI] [PubMed] [Google Scholar]
- Klein M. V., Schwaighofer B. W., Sobel D. F., Fantozzi R. D., Hesselink J. R. Heterotopic brain in the middle ear: CT findings. J Comput Assist Tomogr. 1989 Nov-Dec;13(6):1058–1060. doi: 10.1097/00004728-198911000-00020. [DOI] [PubMed] [Google Scholar]
- Maki Y., Akashi S., Shirai S., Watanabe M., Nose T. [Primary arachnoid cyst of the cerebellopontine angle. A case of cyst of the foramen of Luschka]. No To Shinkei. 1970 Mar;22(3):259–266. [PubMed] [Google Scholar]
- Marubayashi T., Matsukado Y. Intracranial extracerebral brain heterotopia. Case report. J Neurosurg. 1978 Mar;48(3):470–474. doi: 10.3171/jns.1978.48.3.0470. [DOI] [PubMed] [Google Scholar]
- Morgan D. W., Evans J. N. Developmental nasal anomalies. J Laryngol Otol. 1990 May;104(5):394–403. doi: 10.1017/s0022215100158542. [DOI] [PubMed] [Google Scholar]
- Nishio S., Mizuno J., Barrow D. L., Takei Y., O'Brien M. S. Intracranial extracerebral glioneural heterotopia. Childs Nerv Syst. 1988 Aug;4(4):244–248. doi: 10.1007/BF00270923. [DOI] [PubMed] [Google Scholar]
- Ofodile F. A., Aghadiuno P. U., Oyemade O., Adebonojo T. Heterotopic brain in the tongue. Plast Reconstr Surg. 1982 Jan;69(1):120–124. [PubMed] [Google Scholar]
- Orkin M., Fisher I. Heterotopic brain tissue (heterotopic neural rest). Case report with review of related anomalies. Arch Dermatol. 1966 Dec;94(6):699–708. [PubMed] [Google Scholar]
- POPOFF N., FEIGIN I. HETEROTOPIC CENTRAL NERVOUS TISSUE IN SUBARACHNOID SPACE. Arch Pathol. 1964 Nov;78:533–539. [PubMed] [Google Scholar]
- Paller A. S., Pensler J. M., Tomita T. Nasal midline masses in infants and children. Dermoids, encephaloceles, and gliomas. Arch Dermatol. 1991 Mar;127(3):362–366. [PubMed] [Google Scholar]
- Pappas D. G., Brackmann D. E. Arachnoid cysts of the posterior fossa. Otolaryngol Head Neck Surg. 1981 Mar-Apr;89(2):328–332. doi: 10.1177/019459988108900236. [DOI] [PubMed] [Google Scholar]
- Parnes S. M., Nelson L. R. Subarachnoid cyst simulating an intracanalicular acoustic neuroma. Otolaryngol Head Neck Surg. 1981 Nov-Dec;89(6):1019–1020. doi: 10.1177/019459988108900627. [DOI] [PubMed] [Google Scholar]
- Pasyk K. A., Argenta L. C., Marks M. W., Friedman R. J. Heterotopic brain presenting as a lip lesion. Cleft Palate J. 1988 Jan;25(1):48–52. [PubMed] [Google Scholar]
- Rengachary S. S., Watanabe I. Ultrastructure and pathogenesis of intracranial arachnoid cysts. J Neuropathol Exp Neurol. 1981 Jan;40(1):61–83. [PubMed] [Google Scholar]
- Ruff T., Diaz J. A. Heterotopic brain in the nasopharynx. Otolaryngol Head Neck Surg. 1986 Feb;94(2):254–256. doi: 10.1177/019459988609400224. [DOI] [PubMed] [Google Scholar]
- STARKMAN S. P., BROWN T. C., LINELL E. A. Cerebral arachnoid cysts. J Neuropathol Exp Neurol. 1958 Jul;17(3):484–500. doi: 10.1097/00005072-195807000-00009. [DOI] [PubMed] [Google Scholar]
- Schuknecht H. F., Gao Y. Z. Arachnoid cyst in the internal auditory canal. Ann Otol Rhinol Laryngol. 1983 Nov-Dec;92(6 Pt 1):535–541. doi: 10.1177/000348948309200601. [DOI] [PubMed] [Google Scholar]
- Sinn D. P., Wessberg G. A., Coln C. D., Weinberg A. G., Sklar F. H. Neonatal asphyxia secondary to Robin complex and neuroglia heterotopia of nasopharynx. Oral Surg Oral Med Oral Pathol. 1981 Aug;52(2):137–141. doi: 10.1016/0030-4220(81)90309-1. [DOI] [PubMed] [Google Scholar]
- Sumner T. E., Benton C., Marshak G. Arachnoid cyst of the internal auditory canal producing facial paralysis in a three-year-old child. Radiology. 1975 Feb;114(2):425–426. doi: 10.1148/114.2.425. [DOI] [PubMed] [Google Scholar]
- Thijssen H. O., Marres E. H., Slooff J. L. Arachnoid cyst simulating intrameatal acoustic neuroma. Neuroradiology. 1976 Jul 30;11(4):205–207. doi: 10.1007/BF00346080. [DOI] [PubMed] [Google Scholar]
- Wazen J., Silverstein H., McDaniel A., Hays A. Brain tissue heterotopia in the eighth cranial nerve. Otolaryngol Head Neck Surg. 1987 Apr;96(4):373–378. doi: 10.1177/019459988709600412. [DOI] [PubMed] [Google Scholar]
- Wikström S. O., Anniko M. Early development of the stato-acoustic and facial ganglia. Acta Otolaryngol. 1987 Jul-Aug;104(1-2):166–174. doi: 10.3109/00016488709109063. [DOI] [PubMed] [Google Scholar]
- Wilkins R. B., Hofmann R. J., Byrd W. A., Font R. L. Heterotopic brain tissue in the orbit. Arch Ophthalmol. 1987 Mar;105(3):390–392. doi: 10.1001/archopht.1987.01060030110038. [DOI] [PubMed] [Google Scholar]
- Willis R. A. Some unusual developmental heterotopias. Br Med J. 1968 Aug 3;3(5613):267–272. doi: 10.1136/bmj.3.5613.267. [DOI] [PMC free article] [PubMed] [Google Scholar]







