As of the latest update, Google Chrome and Microsoft Edge have made a breaking change to how file uploads are handled. Once your system installs this update, you will not be able to upload new images. Please use another browser until we can get it fixed.

Target sign (tuberculosis)

The target sign of tuberculosis refers to the bull's eye appearance of some parenchymal tuberculomas involving the brain (see: CNS tuberculosis) and solid abdominal organs (see: hepatic and splenic tuberculosis) on cross-sectional imaging. 

Radiographic features

  • hypoechoic nodules with more echogenic or calcified central areas (hepatic tuberculosis)
  • central nidus of calcification surrounded by an area of low attenuation on plain CT
  • central enhancement surrounded by an area of low attenuation and/or ring of enhancement on contrast-enhanced CT
  • central enhancement accompanied by peripheral rim enhancement on post-contrast MRI
Inspired signs
Share article

Article information

rID: 43192
Section: Signs
Synonyms or Alternate Spellings:
  • Target sign in tuberculosis

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1: hepatic tuberculosis
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.