Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery

Objective: To determine anatomic relationships and variation of the round window membrane to bony surgical landmarks on computed tomography. Study design: Retrospective imaging review. Methods: 100 temporal bone images were evaluated. Direct measurements were obtained for membrane position. Vector d...

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Autores principales:	Peter L. Nguy, Sheela Saidha, Ann Jay, H. Jeffrey Kim, Michael Hoa
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2021
Materias:	Round window Cochlear implantation Transtympanic drug delivery Computed tomography Otorhinolaryngology RF1-547 Surgery RD1-811
Acceso en línea:	https://doaj.org/article/a4475fb78dfb418eb93014bf8e298208
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spelling	oai:doaj.org-article:a4475fb78dfb418eb93014bf8e2982082021-12-02T18:11:44ZRadiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery2095-881110.1016/j.wjorl.2018.12.003https://doaj.org/article/a4475fb78dfb418eb93014bf8e2982082021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2095881119301088https://doaj.org/toc/2095-8811Objective: To determine anatomic relationships and variation of the round window membrane to bony surgical landmarks on computed tomography. Study design: Retrospective imaging review. Methods: 100 temporal bone images were evaluated. Direct measurements were obtained for membrane position. Vector distances and angulation from umbo and bony annulus were calculated from image viewer software coordinates. Results: The angle of round window membrane at junction with cochlear basal turn was (42.1 ± 8.6)°. The membrane's position relative to plane of the facial nerve through facial recess was (14.7 ± 5.2)° posterior from a reference line drawn through facial recess to carotid canal. Regarding transtympanic drug delivery, the round window membrane was directed 4.1 mm superiorly from the inferior annulus and 5.4 mm anteriorly from the posterior annulus. The round window membrane on average was angled superiorly from the inferior annulus (77.1 ± 27.9)° and slightly anteriorly from the posterior annulus (19.1 ± 11.1°). The mean distance of round window membrane from umbo was 4 mm and posteriorly rotated 30° clockwise from a perpendicular drawn from umbo to inferior annulus towards posterior annulus. Together, these measurements approximate the round window membrane in the tympanic membrane's posteroinferior quadrant. Conclusions: These radiologic measurements demonstrate normal variations seen in round window anatomy relative to facial recess approach and bony tympanic annulus, providing a baseline to assess round window insertion for cochlear implantation and outlines anatomic factors affecting transtympanic drug delivery.Peter L. NguySheela SaidhaAnn JayH. Jeffrey KimMichael HoaKeAi Communications Co., Ltd.articleRound windowCochlear implantationTranstympanic drug deliveryComputed tomographyOtorhinolaryngologyRF1-547SurgeryRD1-811ENWorld Journal of Otorhinolaryngology-Head and Neck Surgery, Vol 7, Iss 1, Pp 9-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Round window Cochlear implantation Transtympanic drug delivery Computed tomography Otorhinolaryngology RF1-547 Surgery RD1-811
spellingShingle	Round window Cochlear implantation Transtympanic drug delivery Computed tomography Otorhinolaryngology RF1-547 Surgery RD1-811 Peter L. Nguy Sheela Saidha Ann Jay H. Jeffrey Kim Michael Hoa Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery
description	Objective: To determine anatomic relationships and variation of the round window membrane to bony surgical landmarks on computed tomography. Study design: Retrospective imaging review. Methods: 100 temporal bone images were evaluated. Direct measurements were obtained for membrane position. Vector distances and angulation from umbo and bony annulus were calculated from image viewer software coordinates. Results: The angle of round window membrane at junction with cochlear basal turn was (42.1 ± 8.6)°. The membrane's position relative to plane of the facial nerve through facial recess was (14.7 ± 5.2)° posterior from a reference line drawn through facial recess to carotid canal. Regarding transtympanic drug delivery, the round window membrane was directed 4.1 mm superiorly from the inferior annulus and 5.4 mm anteriorly from the posterior annulus. The round window membrane on average was angled superiorly from the inferior annulus (77.1 ± 27.9)° and slightly anteriorly from the posterior annulus (19.1 ± 11.1°). The mean distance of round window membrane from umbo was 4 mm and posteriorly rotated 30° clockwise from a perpendicular drawn from umbo to inferior annulus towards posterior annulus. Together, these measurements approximate the round window membrane in the tympanic membrane's posteroinferior quadrant. Conclusions: These radiologic measurements demonstrate normal variations seen in round window anatomy relative to facial recess approach and bony tympanic annulus, providing a baseline to assess round window insertion for cochlear implantation and outlines anatomic factors affecting transtympanic drug delivery.
format	article
author	Peter L. Nguy Sheela Saidha Ann Jay H. Jeffrey Kim Michael Hoa
author_facet	Peter L. Nguy Sheela Saidha Ann Jay H. Jeffrey Kim Michael Hoa
author_sort	Peter L. Nguy
title	Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery
title_short	Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery
title_full	Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery
title_fullStr	Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery
title_full_unstemmed	Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery
title_sort	radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery
publisher	KeAi Communications Co., Ltd.
publishDate	2021
url	https://doaj.org/article/a4475fb78dfb418eb93014bf8e298208
work_keys_str_mv	AT peterlnguy radiologicanatomyoftheroundwindowrelevanttocochlearimplantationandinnereardrugdelivery AT sheelasaidha radiologicanatomyoftheroundwindowrelevanttocochlearimplantationandinnereardrugdelivery AT annjay radiologicanatomyoftheroundwindowrelevanttocochlearimplantationandinnereardrugdelivery AT hjeffreykim radiologicanatomyoftheroundwindowrelevanttocochlearimplantationandinnereardrugdelivery AT michaelhoa radiologicanatomyoftheroundwindowrelevanttocochlearimplantationandinnereardrugdelivery
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Radiologic anatomy of the round window relevant to cochlear implantation and inner ear drug delivery

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