Spondylolysis and spondylolisthesis in children and adolescents | Revista Española de Cirugía Ortopédica y Traumatología (English Edition)
Angel Gómez-Cintrón, MD, MPH on X: "Because I'm a radiology nerd and love Roentgen classic signs.... Inverted Napoleon Hat Sign. Seen on lumbar/spine AP views with L5-S1 bilateral spondylolysis and pronounced spondylolisthesis
Inverted Napoleon hat sign | Radiology Case | Radiopaedia.org