Nonconcordance between Clinical and Head CT Findings: The Specter of Overdiagnosis

Table 1

Head CT abnormalities identified as contraindications to LP by the Delphi panel.

Head CT abnormalities	Percentage of the Delphi panel who rated the abnormality as 4 or 5 (out of 5)
Lateral shift of midline structures	73
Loss of basilar cisterns	73
Obliteration of the fourth ventricle	91
Subtentorial herniation or tonsillar herniation	100
Obliteration of the superior cerebellar cistern and the quadrigeminal plate cistern with sparing of the ambient cisterns	36