Narrow vertebral interpedicular distance Caudal interpedicular narrowing UMLS:C1863734 Caudal narrowing of interpedicular distances Narrowing (becoming gradually narrower) of the distance between vertebral pedicles that gets progressively more severe towards to caudal (lower) end of the vertebral column. Note that normally, the interpedicular distances get progressively wider as one proceeds down the spine. HP:0008457