Widening of the presacral space (differential)

Last revised by Rohit Sharma on 31 Jul 2023

Widening of the presacral space is one of the diagnostic indicators of diseases involving pelvic pathology and rectal involvement. It is ideally measured on barium studies at the level of S3/4 disc level on lateral radiographs and the normal value of the presacral space is <15 mm in adults.​

There are a large number of potential causes of widening of the presacral space, including:

Imaging differential diagnosis

  • Case 1
  • Case 2: presacral solitary fibrous tumor
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