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  Indian J Med Microbiol
 

Figure 1: Hyperechoic line of the sacrum deepens and L5 lamina appears as a sharp tooth or sail-like structure. In between is the L5 sacrum interspace

Figure 1: Hyperechoic line of the sacrum deepens and L5 lamina appears as a sharp tooth or sail-like structure. In between is the L5 sacrum interspace