"N type: normal root sleeve and nerve roots"
"N type: normal root sleeve and nerve roots"
"A1 type: slightly deformed root sleeves and nerve roots as compared to unaffected site"
"A1 type: slightly deformed root sleeves and nerve roots as compared to unaffected site"
"A2 type: obliteration of the tip of root sleeves and deformed thickened nerve root"
"A2 type: obliteration of the tip of root sleeves and deformed thickened nerve root"
"A3 type: obliteration of the tip of root sleeves and absent nerve root"
"D type: root sleeve defect"
"M type: traumatic meningocele (avulsion pseudomeningocele) formation"
"N type: normal root sleeve and nerve roots"