The opening present at the caudal end of sacral canal is known as sacral hiatus. It is formed due to the failure of fusion of laminae of the fifth (occasionally 4th & 5th) sacral vertebrae. During routine osteology classes of undergraduate MBBS students of CSM Medical University, author came across a sacrum having very small sacral hiatus. Hiatus is present 0.3 cm below the 4th spine. It is 0.5 cm in length. There are two rounded tubercles on either side of the hiatus. Sacral hiatus is utilized for administration of epidural anaesthesia in obstetrics as well as in orthopedic practice for treatment and diagnosis .The knowledge of exact topographical anatomy of sacral hiatus is important for such procedures. Thus reliability and success of caudal epidural anaesthesia depends upon anatomical variations of sacral hiatus. This knowledge is of paramount importance to anaesthetists, surgeons and radiologists
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2022: 6.012
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