We report four cases of sciatica caused by gas in the epidural space with n
o other abnormality. Only 21 similar cases have been reported. Clinical fea
tures are identical to those of common sciatica, and plain radiographs are
often uninformative. Computed tomography shows a low-density epidural colle
ction displacing the nerve root. Joint Bone Spine 2001; 68:434-7. (C) 2001
Editions scientifiques et medicales Elsevier SAS.