Fig. 2From: Efficacy and safety of allogeneic umbilical cord-derived mesenchymal stem cells for the treatment of complex perianal fistula in Crohn’s disease: a pilot studyTreatment procedure. (A) Curettage was performed after the internal orifice was identified. (B) The internal orifice was closed and confirmed. (C) Tightness of the seal was checked through the external opening. (D) UC-MSC solution was injected around the IO and tractsBack to article page