Hi @snow! And do you know what they were testing for with the lumbar puncture? I’ve had a quick check, and there’s a few things they can catch on it, like infections, cancer, haemorrhages, ms, guillan-barre. See, if it was an infection, like meningitis, they can treat it easily. A haemorrhage would have probably been sorted there and then. Cancer, I suspect, would have been referred to another specialist, and stuff like ms would probably need another mri to track if theres any changes, meaning it would require constant monitoring and possibly medication.