Thanks Doc. I looked up lumbar hernias and saw that there were two different types depending on whether they were superior or inferior. However in both cases they were always quite lateral to the spine.

My lump is pretty much over the spine. I don't know if you can see the lump on this photo. (Pardon the fat). It's getting larger by the week and my back feels increasingly like it's going to snap off and that I have to bend forward to stop it from falling off the vertebra below. The scars are from spinal fusions I had done 36 years ago L4-L5-L6 (S1 was sacralised making 6 lumbar vertebra). Due to the angle I had to take the photo, it looks like it's mainly left sided but it does extend over the midline and to the right as well.

Both the physio and the GP say it's definitely solid and not muscle or lipoma.

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