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Meningioma de la vaina del nervio óptico: colaterales optociliares y quiste aracnoideo perióptico / Meningioma of the optic nerve sheath: collateral optociliary veins and the perioptic arachnoidal cyst
Muci-Mendoza, Rafael.
  • Muci-Mendoza, Rafael; Academia Nacional de Medicina. Caracas. VE
Gac. méd. Caracas ; 119(1): 48-54, ene.-mar. 2011. ilus
Article in Spanish | LILACS | ID: lil-680325
RESUMEN
En la década sesenta, antes del advenimiento de la tomografía computarizada de las órbitas, los meningiomas de la vaina del nervio óptico eran considerados de rara ocurrencia y su diagnóstico positivo solo era posible en aquellos casos en que por su tamaño producían proptosis ocular, la que conducía a su estirpación quirúrgica. El tumor de crecimiento tubular, comprime el nervio en forma progresiva hasta atrofiarlo por completo. Sus manifestaciones clínicas incluyen la pérdida gradual de la agudeza visual hasta alcanzar la ceguera, edema del nervio óptico y luego atrofia del mismo, y presencia de venas colaterales optociliares. Este complejo signológico se designa como triada de Hoyt-Spencer. Un hecho patológico distintivo de estos tumores objetivado mediante resonancia magnética de órbitas con administración de gadolinio y supresión de grasa, es la presencia de una dilatación quística del espacio subaracnoideo perióptico entre el limite distal del tumor y el polo posterior del ojo. Presentamos el caso de un paciente ilustrativo con demostración histopatológica de las colaterales venosas y del quiste aracnoideo
ABSTRACT
During the 1970s, before the advent of computerized tomography of orbits, optic nerve sheath meningiomas were considered of rare ocurrence and their positive diagnosis was only posible in those cases in which its size produced ocular proptosis, which led to its surgical removal. Tumor growths in a tubular, compreses progressively the optic nerve and in time produces its atrophic thinning. Clinical manifestation include gradual visual acuity loss until total blindness, optic nerve edema and then optic atrophy, and the presence of collateral optociliary veins. This complex clinical picture is designated as the triad of Hoyt-Spencer. A distinctive fact in these tumors is the presence of a cystic dilatation of the perioptic subarachnoid space between the distal adge of the tumor and the posterior pole, which can be defined using magnetic resonance imaging of the orbits with fat supression following intravenous gadolinium administration. We present the case of a patient with histopatological demostration of the collateral veins and the distal aracnoidal cyst
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Index: LILACS (Americas) Main subject: Optic Nerve / Magnetic Resonance Imaging / Visual Acuity / Exophthalmos / Eye Neoplasms / Gadolinium Limits: Adult / Humans / Male Language: Spanish Journal: Gac. méd. Caracas Journal subject: Medicine Year: 2011 Type: Article Affiliation country: Venezuela Institution/Affiliation country: Academia Nacional de Medicina/VE

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Index: LILACS (Americas) Main subject: Optic Nerve / Magnetic Resonance Imaging / Visual Acuity / Exophthalmos / Eye Neoplasms / Gadolinium Limits: Adult / Humans / Male Language: Spanish Journal: Gac. méd. Caracas Journal subject: Medicine Year: 2011 Type: Article Affiliation country: Venezuela Institution/Affiliation country: Academia Nacional de Medicina/VE