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. 2022 Dec 1;11(23):7156. doi: 10.3390/jcm11237156

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Figure 1

Ab externo scleral resection technique. (A). The medial rectus is disinserted to leave the sclera exposed. (B). Transillumination and marking of the edges of the tumour base. (C). Scleral incision in a polyhedral shape, around the base of the tumour and with 2 mm margins. (D,E). Scleral flap dissection with a straight scalpel. Further marking of the tumour base by transillumination. (F,G). Complete section of the inner sclera and exposed uvea around the tumour base with curved and blunt scissors. (H,I). Careful release of the mushroom-shaped tumour, meticulously separating it from the retina. (J). Complete and tight closure of the coloboma with the external scleral flap.