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Juxtaphrenic peak sign

Dr Yuranga Weerakkody and Dr Andrew Dixon et al.

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

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