Vascularization of the Optic Pathway : V. Chiasma

François, J.; Neetens, A; Collette, J. M.

doi:10.1136/bjo.40.12.730

Cited by 28 publications

(4 citation statements)

References 2 publications

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“… 13 However, Traquair et al suggested that the pial vessel, which supplies the chiasma, undergoes tearing due to stretching, resulting in the functional impairment of the optic chiasma. 15 Hughes et al, who were unable to detect any anatomical disruption of the chiasma itself, opined that the damage was probably due to compromised blood supply to the central area of the chiasma, 16 thus substantiating the theory suggested by Traquair et al However, the chiasma is known to be richly supplied by anastomoses between branches of the anterior communicating artery with the chiasmal artery, anterior cerebral artery, internal carotid artery, posterior communicating artery, anterior choroidal artery, middle cerebral artery and prechiasmal arcade 17 ; hence, the vascular theory for chiasmal damage may not completely explain why the lesion occurs. Hassan et al, in their case report, opined that the mechanism of the injury to the optic chiasma following trauma to the head may vary from individual to individual, being due to one or more of the following: i) mechanical stretch or mechanical tear; ii) contusion haemorrhage; iii) contusion necrosis; and iv) compression necrosis.…”

Section: Discussionmentioning

confidence: 77%

Traumatic chiasmal syndrome: A meta-analysis

Mookan

Thomas

Harwani

2018

American Journal of Ophthalmology Case Reports

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PurposeTo report a case presenting with bitemporal hemianopia due to traumatic chiasmal syndrome after head injury, and to compare the findings with individual case reports published in the literature.MethodsA detailed search was made in PubMed, MedIND, Taylor and Francis online and Wiley online library databases for individual case reports of traumatic chiasmal syndrome. All the case reports were read in full and the findings summarized in a table, which included details of the case who presented with bitemporal hemianopia as an index case.ResultsAll published cases of traumatic chiasmal syndrome appear to share some common features, such as injury to the frontal bone and fracture of the anterior skull base. Bitemporal hemianopia and visual acuity have a variable presentation, and do not appear to correlate with severity of injury. Isolated bitemporal hemianopia is rare and clinical improvement may or may not occur.Conclusions and importanceTraumatic chiasmal syndrome should be considered as a differential diagnosis in patients presenting with bitemporal hemianopia after head injury causing frontal and anterior skull base fracture.

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Section: Discussionmentioning

confidence: 77%

Traumatic chiasmal syndrome: A meta-analysis

Mookan

Thomas

Harwani

2018

American Journal of Ophthalmology Case Reports

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“…The circle of Zinn, the anastomotic ring of branches of the short ciliary arteries, and peripapillary vessels supply the optic disc. 40,41 The superior network is supplied by the anterior cerebral and anterior communicating arteries, whereas the inferior network is supplied by the internal carotid, posterior cerebral, and posterior communicating arteries. 10,39 Pial vessels supply the optic nerve throughout its length; the intraorbital portion is supplied by branches from the ophthalmic artery, and the intracranial optic nerve is nourished by branches of the ophthalmic, anterior cerebral, anterior communicating, and internal carotid arteries.…”

Section: B L O O D S U P P L Y T O T H E V I S U a L P A T H W A Ymentioning

confidence: 99%