title: Malignant non-teratoid medulloepithelioma of ciliary body with retinoblastic differentiation: a case report and review of literature.
abstract: We present a 6-year-old child with intraocular and extraocular mass and high intraocular pressure. The tumor mass involved a disorganized anterior segment and extended through the medial cornea and sclera. A preliminary diagnosis of retinoblastoma with extraocular extension was made. An exenteration of the left globe and orbital tissue was performed. Histological examination showed that the lesion, which occupied the posterior chamber, involved the ciliary body, extending into the iris, sclera and cornea, projecting beyond the cornea anteriorly and extending to the retina posteriorly. The tumor cells were diffusely immunoreactive to vimentin, neuron specific enolase and CD 138. The medulloepithelioma cells were focally positive to cytokeratin (AE1/AE3), cytokeratin 18, CD56,CD57, S100, HMB-45 and bcl2 while areas of retinoblastic differentiation showed diffuse immunoreactivity to synaptophysin, neurofilament and CD138 with focal immunoreactivity to calretinin. All tumor cells showed no immunoreactivity to cytokeratin 7, cytokeratin 20, epithelial membrane antigen, carcinoembryonic antigen, desmin, GFAP, and chromogranin. Nuclear staining for P53 was seen in 80% of tumor cells. The ki-67 index was 90%. The tumor was described as malignant intraocular non-teratoid medulloepithelioma with retinoblastic differentiation arising from the ciliary body. Tumor satellites were seen in the adjacent periocular soft tissue. The treatment involved exenteration of the left globe and orbital tissue with secondary skin graft following chemotherapy. The patient is well and has no recurrence after 1 year of treatment. We report that medulloepithelioma can present as a case of infantile glaucoma, can show signs of intraocular calcifications and can show retinoblastic differentiation.
authors.affiliation: Department of Pathology, Faculty of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates. suhaila@uaeu.ac.ae
authors.forename: Suhail
authors.initials: S
authors.lastname: Al-Salam
authors.forename: Kais
authors.initials: K
authors.lastname: Algawi
authors.forename: Moueid
authors.initials: M
authors.lastname: Alashari
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D002454:Cell Differentiation; D002648:Child; D002924:Ciliary Body / Q000473:pathology*; D003937:Diagnosis, Differential; D005134:Eye Neoplasms / Q000378:metabolism / Q000473:pathology*; D005901:Glaucoma / Q000209:etiology; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D018242:Neuroectodermal Tumors, Primitive / Q000378:metabolism / Q000473:pathology*; D012175:Retinoblastoma / Q000473:pathology
chemical_list: D014408:Biomarkers, Tumor