Callosal angle

A.Prof Frank Gaillard et al.

The callosal angle has been proposed as a useful marker of patients with idiopathic normal pressure hydrocephalus (iNPH), helpful in distinguishing these patients from those with ex-vacuo ventriculomegaly (see hydrocephalus versus atrophy). 

Method

Ideally the angle should be measured on a coronal image perpendicular to the anterior commissure -posterior commissure (AC-PC) plane at the level of  the posterior commissure 1,2.

Values

In general patients with iNPH have smaller angles than those with ventriculomegaly from atrophy or normal controls. 

A normal value is typically between 100-120°. In patients with iNPH that value is lower, between 50-80° 2.  

In one study, symptomatic iNPH patients who responded to shunting had a significantly smaller mean preoperative callosal angle (59° (95% CI 56°-63°)) compared with those who did not respond (68° (95% CI 61°-75°)) 1

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Article information

rID: 37405
Section: Signs
Synonyms or Alternate Spellings:

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