Ultrasound findings in Terson's syndrome: two case reports.

Terson's syndrome describes the concurrence of intracranial hemorrhage, vitreous hemorrhage and juxtapapillary subinternal limiting membrane and retinal hemorrhage. In most cases, the retinal and vitreous hemorrhage will clear spontaneously. Vitrectomy was indicated by persistent hemorrhage in two cases. Ultrasound was used to follow up the changes including premacular hemorrhage that appeared as a dome-shaped, smooth, mildly elevated, immobile membrane overlying the posterior pole. This membrane which represents the posterior hyaloid or internal limiting membrane is usually highly reflective due to the submembranous blood adherent to its posterior surface. Consequently, it may mimic localized detachment of the posterior pole. Differentiation from retinal detachment can usually be made by considering the history and other clinical findings. The clinical manifestations of Terson's syndrome, correlated well with the ultrasound findings until vitrectomy was done.