A 10-year-old boy with clinically confirmed congenital pupillary-iris-lens membrane with goniodysgenesis underwent light microscopic examination of the enucleated eye. The anterior segment changes consisted of the absence of the iridial pupillary sphincter muscle and dilator muscle processes. Endothelialization and descemetization of the anterior chamber angle and the anterior surface of the iris covered the original eccentric pupillary opening (occlusio pupillae), but grew around the fibrotic edges of the surgically created, patent pseudopupil, probably secondary responses to surgery. The anterior chamber findings in this case establish a localized syndrome that includes absence of the pupillary sphincter and dilator muscle processes. Incomplete development of the iris may be partly attributable to an abnormality of stromal development and inductions by the anterior neuroectodermal layer, together with anomalies of the pupillo-iridial vasculature.
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