Modified fetoscopic laser surgery in twin-to-twin transfusion syndrome with proximate cord insertions: a report of two cases and literature review.

Proximate cord insertions (PxCIs) are a variant of umbilical cord insertions (CIs) that can be identified in monochorionic (MC) twins, making fetoscopic laser photocoagulation for twin-to-twin transfusion syndrome (TTTS) technically challenging. The existing literature is controversial for successful fetoscopic laser photocoagulation in TTTS cases with PxCIs. We presented two cases with TTTS complicated by PxCIs that underwent a successful laser ablation using our proposed technique.