Fig. 11. To prevent slippage of the posterior retinal flap, the cannulated extrusion needle is used to remove as much fluid as possible along or under the posterior edge of the giant break. (Freeman HM: Current management of giant retinal breaks and fellow eyes. In Glaser BM, Ryan SJ (eds): Surgical Retina, 2nd ed, pp 2313–2338. St. Louis, CV Mosby, 1994)