Figure 1.

Overview of evolution of different sonolucent polymethyl methacrylate (PMMA) implants used in this patient cohort. (A) Large, slightly curved piece used as raw material for cutting of a specific cranioplasty after outlining the size (top) and after cut out (bottom). (B) Similar to A, a large PMMA implant was cut to a specific size as needed to cover a cranial defect of a recraniotomy defect with additional craniotomy. A piece of telfa (white) was used to outline the size needed. (C and D) Small, disk-shaped implant curved (C) or flat (D) depending on the needs that could be used with minimal to no additional cutting or shaping.