No Room for Excess Room: Cobra Head Deformity of Both Discs of an Amplatzer Atrial Septal Occluder Device.

To our knowledge, this is the first case in the literature citing cobra head deformity of both atrial discs. A large delivery sheath with excess room possibly led to deformity in our case. This case highlights the importance of following manufacturer- recommended sheath sizes for optimal device implantation.