Juxtaphrenic peak sign explained

Juxtaphrenic peak sign is a radiographic sign seen in lobar collapse or after lobectomy of the lung.^{[1] [2]} This sign was first described by Katten and colleagues in 1980, and therefore, it is also called Katten's sign.^[3] The juxtaphrenic peak is most commonly caused due to the traction from the inferior accessory fissure.^{[2] [4]} The prevalence of the juxtaphrenic peak sign increases gradually during the weeks after lobectomy of the lung.^[5]

Notes and References

1. Kattan . K. R. . Eyler . W. R. . Felson . B. . The juxtaphrenic peak in upper lobe collapse . Radiology . March 1980 . 134 . 3 . 763–765 . 10.1148/radiology.134.3.7355230 . 7355230 . 14 July 2021 . 0033-8419.
2. Kumaresh . Athiyappan . Kumar . Mitesh . Dev . Bhawna . Gorantla . Rajani . Sai . PM Venkata . Thanasekaraan . Vijayalakshmi . Back to Basics – 'Must Know' Classical Signs in Thoracic Radiology . Journal of Clinical Imaging Science . 31 July 2015 . 5 . 43 . 10.4103/2156-7514.161977 . 26312141 . 4541161 . 2156-7514 . free .
3. Cameron . D. C. . The juxtaphrenic peak (Katten's sign) is produced by rotation of an inferior accessory fissure . Australasian Radiology . November 1993 . 37 . 4 . 332–335 . 10.1111/j.1440-1673.1993.tb00091.x . 8257331 . 14 July 2021 . 0004-8461.
4. Davis . S. D. . Yankelevitz . D. F. . Wand . A. . Chiarella . D. A. . Juxtaphrenic peak in upper and middle lobe volume loss: assessment with CT . Radiology . January 1996 . 198 . 1 . 143–149 . 10.1148/radiology.198.1.8539368 . 8539368 .
5. Konen . E. . Rozenman . J. . Simansky . D. A. . Yellin . A. . Greenberg . I. . Konen . O. . Hertz . M. . Itzchak . Y. . Prevalence of the juxtaphrenic peak after upper lobectomy . AJR. American Journal of Roentgenology . October 2001 . 177 . 4 . 869–873 . 10.2214/ajr.177.4.1770869 . 11566691 . 14 July 2021 . 0361-803X.