treated with Abnormality of the Skeletal System Biconcave Vertebral Bodies Fish Mouth Deformity Step Vertebrae Exaggerated concavity of the anterior or posterior surface of the vertebral body, i.e., the upper and lower vertebral endplates are hollowed inward. Fish Vertebrae SCDO:0000118 Biconcave Vertebrae Sufficient HP:0004586 Analgesic