Appendix
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Ophthalmology

Orbital Vascular Anomalies

Vascular anomalies of the orbit represent a heterogeneous group of vascular lesions found within the orbit. A profound understanding of the natural course, appropriate nomenclature, clinical features, and imaging characteristics is essential for accurate diagnosis and appropriate management. This activity reviews the recently laid-out guidelines by the International Society for the Study of Vascular Anomalies (ISSVA) and describes the evaluation and management of OVAs. It also highlights the rol

v1 · Reviewed Nov 7, 2026 by Automated Clinical Reviewer (Strict Verbatim v1)
  • Optic nerve compromise and permanent axial length modification render the visual impairment irreversible.
  • Sudden worsening of proptosis may result from bleeding within the lesion or from an upper respiratory infection of viral etiology that upregulates the lymphatic system and, in turn, causes rapid expansion of the lymphatic plexus.
  • Massive hemorrhage may lead to motility limitation and visual impairment.
  • The presence of pulsating proptosis and an objective bruit is a more specific feature of high-flow CCFs.
  • One must look for mechanical ptosis in cases of infantile hemangioma, which may result in refractive and stimulus-deprivation amblyopia.
  • Clinical features include gradual-onset axial proptosis, blurred vision, pain, or diplopia.
  • The risk of amblyopia should be a key consideration when managing childhood vascular anomalies.
  • Imaging forms a critical component of the diagnostic evaluation of OVAs and plays a crucial role in treatment planning.
  • Arterial flow can be visualized on Color Doppler Ultrasonography (USG).
  • Magnetic resonance imaging (MRI) reveals a lesion that is slightly hypointense relative to the extraocular muscles on the T1-weighted (T1W) sequence, markedly enhances with contrast, and appears hyperintense on the T2-weighted (T2W) sequence.
  • Diffusion-weighted imaging (DWI) MRI has recently gained popularity due to its ability to qualitatively and quantitatively differentiate benign from malignant lesions using apparent diffusion coefficient (ADC) values.
  • On computed tomography, a hemangioma appears as a hyperdense lesion with homogeneous contrast enhancement.
  • USG (A- and B-scans) is a useful, noninvasive imaging modality, particularly for initial evaluation.
  • Phleboliths, which are pathognomonic of venous malformations and are caused by chronic inflammation in long-standing cases, may appear as hyperdense, calcified areas within the mass.
  • MRI is the investigation of choice for evaluating and guiding the treatment of vascular malformations.
  • High ADC values greater than 2.8 mm/s on DWI MRI are 100% sensitive and specific for Type–2 OVM.
  • Outpatient evaluation of a CCF should include intra-ocular pressure assessment, exophthalmometry, pneumotonometry, and color doppler ultrasonography.
  • A difference in ocular pulse amplitude (OPA) of more than 1.6mm between the eyes is 100% sensitive and 93% specific for CCFs.
  • The presence of multiple flow voids, which correspond to high-flow vessels, is a characteristic feature on MRI.
  • Digital subtraction angiography, in which contrast is directly injected into the feeding vessels and then digitally acquired, is the gold standard for evaluating AVMs.
Schobinger’s classification
Stage I represents the quiescent phase and is characterized by warm, pink-blue lesions. Stage II is marked by expansion with pulsation, thrill, and bruit. Stage III involves tissue destruction, including ulceration, bleeding, and dystrophic skin changes. Stage IV represents decompensation, with high-output cardiac failure.
  • Medical management, primarily beta-blockers, namely oral propranolol and topical timolol maleate, forms the mainstay of treatment of hemangioma.
  • The child must undergo a comprehensive cardiac evaluation before initiation of therapy.
  • A gel-forming solution of timolol is as effective as systemic therapy and is associated with negligible life-threatening complications.
  • For congenital hemangioma, there is no proven medical management.
  • Surgical excision, usually performed between ages 2 and 5, remains the first-line treatment.
  • Observation and periodic follow-up are encouraged in asymptomatic CVMs.
  • The therapy goals in venous malformations are to reduce the symptoms (persistent pain), improve function (optic neuropathy and corneal exposure leading to visual loss, tense hemorrhage), and achieve acceptable cosmesis.
  • A combined approach of preoperative embolization followed by resection of the nidus is the preferred management strategy.
  • Dural fistulas are frequently managed conservatively, as approximately 70% close spontaneously due to localized thrombosis of the superior ophthalmic vein.
  • In the absence of high-risk features, a conservative approach is the first-line treatment, including observation, intermittent carotid compression, or IOP-lowering agents.
n-butyl cyanoacrylate
Endovascular
Adult
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Renal
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detachable balloon
Endovascular
Adult
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Renal
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ethyl vinyl alcohol polymer
Endovascular
Adult
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Renal
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  • Intralesional sclerosing agents, such as bleomycin, are reserved for patients unresponsive to propranolol therapy and are seldom used as the initial mode of treatment.
  • The role of intralesional bevacizumab is unclear, and the drug is under experimental phases.
  • Lasers are not recommended for infantile hemangioma, except for the treatment of residual skin changes and scars following resolution.
  • For very large NICH, pre-operative embolization by an interventional neuroradiologist prevents the risk of excessive bleeding during surgery.
  • Percutaneous sclerotherapy has also been described as a minimally invasive treatment reserved for patients unwilling to undergo surgery or in cases where iatrogenic risks outweigh the benefits of intervention.
  • Intralesional injection of pingyangmycin (bleomycin A5) significantly reduces intralesional volume and provides pain and proptosis relief.
  • Sclerotherapy: for extensive facial involvement and lesions not amenable to surgical resection
  • Microcystic lymphatic malformations also respond well to drugs like sirolimus.
  • Some of these can be managed conservatively as they may carry significant surgical morbidity and iatrogenic risk of damaging surrounding structures.
  • While performing a carotid massage, it is advisable to use the contralateral hand to compress the ipsilateral ICA.
  • Lesions extending to the orbital apex, large-sized anomalies, and those associated with optic neuropathy are associated with a higher risk of vision-related complications following surgery.
  • Other possible complications include ptosis and motility limitations, which usually resolve within a few months.
  • Recurrence is not uncommon.
  • The risk of amblyopia should be a key consideration when managing childhood vascular anomalies.
  • Patients and their family members must be counseled and encouraged to follow up promptly with their treating ophthalmologist, pediatrician, and the associated radiologist.
  • To make informed decisions, patients must be educated about the nature of the lesion, possible complications, and the risks and benefits of the recommended intervention.
  • Interprofessional collaboration among ophthalmologists specializing in orbit, an interventional neuroradiologist, and a pediatrician is essential.
  • Shared decision-making, coordination, and effective communication are critical to maximizing favorable outcomes.
  • review
    Orbital Vascular Anomalies. StatPearls [Internet] — Ayushi Agarwal, Akash A. Raut — StatPearls Publishing, 2023

Decision support only. Verify against local protocols and current labeling. Source: www.ncbi.nlm.nih.gov