Knuckle sign

Knuckle sign is a radiologic sign used for diagnosing pulmonary embolism.[1][2] The presence of a blood clot in the branch of a pulmonary artery can resemble a knuckle in CT and X-ray images, which is why it is called knuckle sign.[3] It is frequently seen along with other signs of pulmonary embolism, such as the Fleischner sign and Westermark sign.[2]

References

  1. ↑ "Eurorad.org". Eurorad - Brought to you by the ESR. Retrieved 14 July 2021.
  2. 1 2 Kumaresh, Athiyappan; Kumar, Mitesh; Dev, Bhawna; Gorantla, Rajani; Sai, PM Venkata; Thanasekaraan, Vijayalakshmi (31 July 2015). "Back to Basics – 'Must Know' Classical Signs in Thoracic Radiology". Journal of Clinical Imaging Science. 5: 43. doi:10.4103/2156-7514.161977. ISSN 2156-7514. PMC 4541161. PMID 26312141.
  3. ↑ Chiarenza, Alessandra; Esposto Ultimo, Luca; Falsaperla, Daniele; Travali, Mario; Foti, Pietro Valerio; Torrisi, Sebastiano Emanuele; Schisano, Matteo; Mauro, Letizia Antonella; Sambataro, Gianluca; Basile, Antonio; Vancheri, Carlo; Palmucci, Stefano (4 December 2019). "Chest imaging using signs, symbols, and naturalistic images: a practical guide for radiologists and non-radiologists". Insights into Imaging. 10 (1): 114. doi:10.1186/s13244-019-0789-4. ISSN 1869-4101. PMC 6893008. PMID 31802270.
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