Fig. 20. A-C. Ultrasonography of vitreoschisis. Splitting of the vitreous cortex (arrow) can occur and mimic posterior vitreous detachment. In diabetic patients, blood can be present in the vitreoschisis cavity and can be detected by B-scan ultrasonography. (I, inner wall; P, posterior vitreous cortex) (Courtesy of Dr. Ronald Green; Green RL, Byrne SF: Diagnostic ophthalmic ultrasound. In Ryan SJ [ed]: St. Louis, CV Mosby, 1989)