case_images: PMC6889425_01
case_images: PMC6889425_02
case_images: Schematic diagram with surgical view describing AHM pneumatic dissection technique showing the needle tip visualization in cross-sectional diagram view, microscopic diagram view, and actual surgical screen capture
case_images: 40942_2019_191_Fig1_HTML.jpg
case_images: PMC6889425_02_40942_2019_191_Fig1_HTML.jpg
case_images: Fig1
case_images: It is critical at this point to visualize the tip of the needle behind the lens to confirm entrance into the vitreous cavity before any air injection (Fig. 1).
case_images: The needle tip is rotated 90  with retraction parallel to the pars plana
case_images: 40942_2019_191_Fig2_HTML.jpg
case_images: PMC6889425_02_40942_2019_191_Fig2_HTML.jpg
case_images: Fig2
case_images: After visualizing the needle tip behind the lens, the needle is rotated 90  parallel to the limbus and gently retracted until mild resistance from the bent needle reaching the pars-plana is felt (Fig. 2).
case_images: Pneumatic dissection anterior to the AHM
case_images: 40942_2019_191_Fig3_HTML.jpg
case_images: PMC6889425_02_40942_2019_191_Fig3_HTML.jpg
case_images: Fig3
case_images: Filtered air is then injected under direct microscopic visualization (Fig. 3) (Additional file 1: Video 1).