[Brain aneurysms treatment with pCONus2 device. Initial experience at IMSS].

Background: pCONus2 device has been used in some countries as coadyuvant in the treatment of wide-neck bifurcation aneurysms with coils. Objective: To present the first series of brain aneurysms treated with pCONus2 in the Mexican Institute for Social Security (IMSS). Material and methods: We retrospectively present the first 13 aneurysms treated from October 2019 to February 2022 with pCONus2 device at a third level hospital. Results: 6 aneurysms located at anterior communicating artery, 3 at middle cerebral artery bifurcation, 2 at internal carotid artery bifurcatión, and 2 at the tip of basilar artery were treated. Device deployment was performed without complications and it was possible to embolize aneurysms with coils in 12 patients (92%), while on an internal carotid bifurcation aneurysm (8%) there was an incident of a pCONus2 petal migration toward vascular lumen caused by coils mesh pressure, situation that was solved by placing an nitinol self-expandable microstent. In 7 cases (54%) we performed coiling technique after microcatheter passage through pCONus2, while in 6 cases (46%) we used the jailing technique without complications. Conclusions: pCONus2 is a useful device for wide-neck bifurcation aneurysms embolization. In Mexico our experience is yet limited; however, the first cases have been successful. Furthermore, we showed the first cases treated using jailing technique. Much more cases are required in order to carry out a statistically conclusive analysis and to establish the effectiveness and safety of the device.