“…163 Histologically, primary iris stromal cysts are lined with a multi-layered squamous or cuboidal epithelium, which may or may not contain mucin-secreting goblet cells. 138,139,142,163,[168][169][170]173,174,178,179 Occasionally, focal keratinisation of the epithelial lining has been observed. 170,180 Immunohistochemical studies have demonstrated a positive reaction for epithelial cytokeratin markers and a negative result for the S100 antigen.…”