Medical Definition of Featureless thecal sac
1.
No nerve roots seen (in lumbar spine; roots not seen in T-spine) Differential diagnosis: arachnoiditis, Pantopaque, infection, haemorrhage, surgery / RT, subdural injection, contrast flows, unlike epidural injection, nerve roots seen as they exit, but not between disc levels
(12 Dec 1998)
Lexicographical Neighbors of Featureless Thecal Sac
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