Fig. 2

a During the operation, a turbid whitish cystic fluid was naturally drained from a simple incision site in the 8 o’clock cornea. b Histopathologic stain (Giemsa) of the exudate from the corneal lesion revealed mucin, a few stratified squamous epithelial cells, and some necrotic debris. c Fourteen months after surgery, the recurred corneal lesion almost covered the pupil entirely. d One month after the second surgery, i.e. cauterization with 2.5% TCA for 5 min, recurrence and newly formed epithelial budding of the cyst can be seen at its superior margin, extending to 12 o’clock (arrow). This prompted a third surgery