What does "Transverse processes of L4-S1" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
"Transverse processes of L4-S1" refers to specific parts of the spine. The spine is made up of many small bones, and each of these bones has a pair of bony projections on the sides, which are called transverse processes. L4-S1 refers to the specific bones in the lower back, with L4 being one of the lowest bones in the lumbar (or lower) spine and S1 being the first bone in the sacral (or pelvic) region of the spine. So, "transverse processes of L4-S1" means the side projections of the specific bones in the lower back and upper pelvic area.
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