Sacral deformity

Kyphosis is an abnormally excessive convex curvature of the spine as it occurs in the thoracic and sacral regions. Abnormal inward concave lordotic curving of the cervical and lumbar regions of the spine is called lordosis. [Source: Wikipedia ]

Curved sacrum
Sickle-shaped sacrum
May Be Caused by
Currarino triad
Imperforate anus
Presacral teratoma
Spinal lipoma
Tethered cord syndrome