Elderly male presented with low back pain increased in flexion movements.
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CT reveals hypertrophic-degenerative changes at the level of the spinous processes of the L3 and L4 vertebrae, there is abnormal contact of the spinous processes (kissing spines), with subcortical sclerotic changes at interspinous surfaces and interspinous degenerative vacuum phenomenon.
Finding most suggestive of Baastrup syndrome.
Baastrup disease is an unusual cause of lower back pain. This case illustrates typical findings of Baastrup disease with kissing spines.