pterygium https://github.com/monarch-initiative/mondo/issues/8786 https://www.malacards.org/card/multiple_pterygium_syndrome_escobar_variant ICD9:372.4 pterygium of conjunctiva and cornea DOID:0002116 SCTID:77489003 MONDO:0005085 ICD9:372.40 UMLS:C0033999 NCIT:C133744 EFO:0000678 ICD10CM:H11.0 MESH:D011625 A wedge-shaped fibrovascular lesion arising from the bulbar conjunctiva and extending to the cornea. It is caused by chronic exposure to solar ultraviolet radiation, heat, and dust. It may cause severe vision loss. Studies have linked pterygium to neoplastic proliferation and suggest that it may be a stem cell disorder. MEDGEN:46202 icd11.foundation:1207385905 benign conjunctival neoplasm benign neoplasm of cornea ocular growth disorder