Juxtaphrenic peak sign

The juxtaphrenic peak sign, also known as diaphragmatic tenting or Kattan sign, refers to the peaked or tented appearance of a hemidiaphragm which can occur in the setting of lobar collapse. It is caused by retraction of the lower end of diaphragm at an inferior accessory fissure (most common 1), major fissure or inferior pulmonary ligament. It is commonly seen in upper lobe collapse but may also be seen in middle lobe collapse.

History and etymology

It was first described by Kenneth R Kattan, an American radiologist, and his colleagues in 1980 6.

Chest x-ray
Share article

Article information

rID: 18810
System: Chest
Section: Signs
Tag: stub, cases
Synonyms or Alternate Spellings:
  • Kattan's sign
  • Kattan sign
  • Juxtaphrenic peak
  • Juxta-phrenic peak sign
  • Juxtaphrenic peak (JP)
  • Diaphragmatic tenting
  • Tenting of the diaphragm

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    Luftsichel sign
    Case 1: in left upper collapse
    Drag here to reorder.
  • Drag
    Case 2 : on right
    Drag here to reorder.
  • Drag
    Case 3: on right with RUL collapse
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

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

    Alert accept Thank you for updating your details.