Radiology Signs -Juxta Phrenic Peak Sign

By Deepu
The juxtaphrenic peak 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, major fissure or inferior pulmonary ligament. It is commonly seen in upper lobe collapse but may also be seen in middle lobe collapse.

The negative pressure of upper lobe atelectasis causes upward retraction of the visceral pleura, and protrusion of  extrapleural fat into the recess of the fissure is responsible

Occurs in upper lobe atelectasis, describes the triangular opacity projecting superiorly at the medial half of the diaphragm