File:Nerve root anomalies.png

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Classification of conjoined nerve roots.[1]

Type General Anomaly n-A n-B
Type 1 Aberrant courses 1A: two pairs of nerve roots arise from a single dural sleeve 1B: A dural sleeve arises from a low position on the dural sac
Type 2 Variable nerve roots in an intervertebral foramen 2A: A foramen is unoccupied by a nerve, with the foramen above or below containing two sets of roots 2B: A foramen contains a supernumerary set of roots
Type 3 Extradural anastomoses between roots in which a bundle of nerve fibres leaves one dural sleeve to enter an adjacent sleeve. May be superimposed on a type 2
  1. โ†‘ Morishita et al.. Intra-operative identification of conjoined lumbosacral nerve roots: a report of three cases. Journal of orthopaedic surgery (Hong Kong) 2012. 20:90-3. PMID: 22535819. DOI.

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