Moreover, occludin expression was lower in bAVM lesion samples compared to CCM lesion specimens (14.29 ± 14.54 vs. 30.08 ± 17.84, p-value = 0.0177), whereas no differences were found in claudin expression between both lesions (mean 12.15 ± 8.96 vs. 21.93 ± 16.26 mean, p-value = 0.058). Here, OCLN is linked to cerebral cavernous malformation.