Anatomical topography of the inferior lumbar triangle for transversus abdominis block.

The shape, the size, useful points, geometry, and topography of the ILT are important to determine the orientation points during block procedures. It is possible to visualize the needle pathway in different shape of ILT to ultrasound-guided TAP block. Anesthetic intervention needs to be individualized, depending upon the size of the triangle. The findings may be useful in establishing the area with the highest probability of localization of the ILT which can improve both the safety and efficiency of TAP block.