Year : 1993 | Volume
: 41 | Issue : 2 | Page : 88--90
Pulsating enophthalmos in aplasia of sphenoid wing
Vimala Menon, S Vashisht, KK Gupta, J Singh, Prem Prakash
Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi - 110 029
|How to cite this article:|
Menon V, Vashisht S, Gupta K K, Singh J, Prakash P. Pulsating enophthalmos in aplasia of sphenoid wing.Indian J Ophthalmol 1993;41:88-90
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Menon V, Vashisht S, Gupta K K, Singh J, Prakash P. Pulsating enophthalmos in aplasia of sphenoid wing. Indian J Ophthalmol [serial online] 1993 [cited 2021 Jun 13 ];41:88-90
Available from: https://www.ijo.in/text.asp?1993/41/2/88/25613
Unilateral aplasia of sphenoid wing is a rare disorder. Its association with neurofibromatosis has been stressed, , the most impressive and common clinical feature of which is a pulsating exophthalmos. However, aplasia of sphenoid wing showing pulsating enophthalmos with other stigmata of neurofibromatosis has also been described in the literature. ,,,[6[,]7],, This report also describes a case of aplasia of sphenoid wing with pulsating enophthalmos but without any other stigmata of neurofibromatosis.
A 14-year old male complaining of pulsations in the left eye of two weeks duration was examined. At the time of birth his parents had noted prominence of the left eye and fullness over the left temporal fossa. Cafe-au-lait spots were not seen in the patient or in any other family member. A general physical examination revealed fullness of the left temporal fossa [Figure 1]. The fullness was bony and the soft tissue over the prominence was normal.
Visual acuity measured 6/5 in both eyes. The left eye was enophthalmic (Hertel's 15mm & 12mm at 93 base reading) and pulsatile, the pulsations being synchronous with the carotid pulse. The left eyeball proptosed by 4mm on Valsalva maneuver and by 2mm on head hanging. The left eyeball could also be pushed back 6-7mm into the orbit without any discomfort to the patient. No thrill or bruit was detected over the eye ball, forehead or neck. Ocular motility, fundus and visual field examination were normal.
Orbit radiography and CT scan [Figure 2] revealed enlargement of the left orbital ring with partially deficient greater wing of sphenoid, elevation of the lesser wing of sphenoid and lateral displacement of the innominate line. The middle cranial fossa was enlarged anteriorly, laterally and downwards. These findings were suggestive of sphenoid wing aplasia. The carotid angiography was interpreted as normal. B-Scan ultrasonography showed the presence of a laterally situated, well-defined mass in the orbit [Figure 3]a which increased in size on Valsalva maneuver [Figure 3]b. The orbital fat was considerably reduced in thickness [Figure 4]a and M-Scan ultrasonography showed intracranial pulse waves transmitted to the eyes and the orbital structure [Figure 4]b.
Aplasia of sphenoidal wing is clinically characterised by painless pulsatile exophthalmos, absence of bruit or thrill and any diplopia or neurological deficit. , The diagnosis is confirmed by the characteristic radiological features of enlarged bare orbit. ,,,,,
The pulsations are due to intracranial pulse waves transmitted to the orbital contents through a major defect in the orbital wall. ,,,,, In this case M-Scan ultrasonography showed transmitted intracranial pulsations to the eye and orbital structures.
Exophthalmos is the common presentation of aplasia of sphenoid wirig while this case had shown enophthalmos in erect posture. Review of the literature has revealed only seven such reported cases of pulsating enophthalmos. ,,,,,, However Savino  believed that two of these cases were not due to the aplasia of sphenoid wing while the other two reports gave only obscure details. , Previous authors have suggested that the enophthalmos was due to atrophy of orbital fat.
In this case, A scan ultrasonography revealed a less dense retro-orbital fat pad which in the absence of history of trauma could be due to constant intracranial pulsation transmitted to the orbit causing fat atrophy. The increased volume of the orbital cavity and middle cranial fossa could also contribute to the enophthalmos. Cases of aplasia of sphenoid wing may show enophthalmos or exophthalmos depending on the extent of encephalocoele, the orbital contents and the capacity or volume of the orbit and middle cranial fossa. Aplasia of sphenoid wing is associated with neurofibromatosis in over 50% cases. The nature of this association, however remains obscure sub .
All the reported cases of pulsating enophthalmos had other features of neurofibromatois; the patient reported here did not have any other stigmata of neurofibromatosis.
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