Pontomesencephalic angle

Case contributed by Dr Henry Knipe
Modality: Annotated image

Normal pontomesencephalic angle (55-75˚ is within normal limits). The angle is measured between two lines drawn:

  • anterior aspect of the midbrain
  • anterosuperior aspect of the pons

Case courtesy of Dr Bruno Di Muzio, Radiopaedia.org, rID: 39310. Modifications: red lines, crop. 

Modality: Annotated image

Reduced pontomesencephalic angle in intracranial hypotension due to CSF overshunting. 

Original case courtesy of Dr Andrew Dixon, Radiopaedia.org, rID: 17455. Modifications: crop, red lines. 

Case Discussion

A pontomesencephalic <50˚ is suggestive of intracranial hypotension (other features should be present). 

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Case Information

rID: 39701
Case created: 16th Sep 2015
Last edited: 16th Sep 2015
Inclusion in quiz mode: Excluded

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