Comparison of indocyanine green angiography and optical coherence tomographic angiography in polypoidal choroidal vasculopathy

Purpose To compare optical coherence tomographic angiography (OCTA) and indocyanine green angiography (ICGA) images for detecting polypoidal lesions (PLs) and branching vascular networks (BVNs), and to measure the polypoidal areas (PAs) in patients with polypoidal choroidal vasculopathy (PCV). Methods All patients underwent ICGA, optical coherence tomography (OCT), and OCTA. We compared the detection sensitivity for PL and BVN, as evaluated by the ICGA and OCTA images. Furthermore, PA measured by ICGA was divided into two groups: one in which the area could be measured by OCTA (ICGA(+) OCTA(+)) and the other in which the area could not be measured by OCTA (ICGA(+) OCTA(-)). Results Twenty-one consecutive eyes of 21 patients (mean age, 73.8 +/- 9.8 years) were included. ICGA detected PL in all eyes (100%), whereas OCTA detected PL in 16 eyes (75.2%); ICGA detected BVN in 15 eyes (71.4%), whereas OCTA detected BVN in 20 eyes (95.2%). The mean PA in ICGA(+) OCTA(+) and ICGA(+) OCTAwas 0.24 +/- 0.04 and 0.14 +/- 0.01mm2, respectively; a significant difference was observed between ICGA(+) OCTA(+) PA and ICGA(+) OCTA-PA (Po0.0001). In addition, the mean PA in the ICGA(+) OCTA(+) group measured by ICGA and OCTA was 0.24 +/- 0.04 was 0.19 +/- 0.04mm(2), respectively; these values were significantly different (P= 0.0046). Conclusions OCTA might detect more BVNs and fewer PLs compared with ICGA, and PL detected by OCTA might be smaller than those detected by ICGA.