2020–2021 BCSC Basic and Clinical Science Course™
7 Oculofacial Plastic and Orbital Surgery
Part I: Orbit
Chapter 5: Orbital Neoplasms and Malformations
Vascular Tumors, Malformations, and Fistulas
An orbital hemorrhage may result from trauma, surgery, or spontaneous bleeding from vascular malformations (Fig 5-8). In rare instances, a spontaneous hemorrhage may be caused by a sudden increase in venous pressure (eg, due to a Valsalva maneuver). A spontaneous orbital hemorrhage almost always occurs in the superior subperiosteal space. It should be allowed to resorb unless there is associated visual compromise, in which case urgent drainage is indicated. Also see the section Orbital Compartment Syndrome in Chapter 6.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.