RT Journal Article T1 Utility of optical coherence tomography in a case of bilateral congenital macular coloboma A1 Munoz de Escalona Rojas, Jose Enrique A1 Quereda Castaneda, Aurora A1 Garcia Garcia, Olga K1 Macular coloboma K1 nephrocalcinosis K1 optical coherence tomography K1 renal hypomagnesemia with ocular involvement K1 Claudin-19 AB Macular coloboma is a congenital defect of the retina and choroid in the macular region. It may appear due to an intrauterine inflammation or a developmental abnormality. Familial hypomagnesemia with hypercalciuria and nephrocalcinosis (FHHNC) is a result of malformation of the renal tubule. Its combination with ocular manifestations may be genetic, specifically in case of claudin-19 (CLDN-19) gene mutations. The combination of FHHNC and ocular manifestations is not always present in these patients. Optical coherence tomography (OCT) helps us diagnose this condition by allowing us to evaluate and confirm the absence of retina layers without histological examination. Although genetic testing is necessary to diagnose mutational alterations of the CLDN-19 gene, in our case, it was not necessary to diagnose the FHHNC patient with macular coloboma, since the diagnosis of ocular damage had been already accurately established by the OCT. PB Medknow publications & media pvt ltd SN 0301-4738 YR 2016 FD 2016-09-01 LK http://hdl.handle.net/10668/19355 UL http://hdl.handle.net/10668/19355 LA en DS RISalud RD Apr 20, 2025