The dark bronchus sign is the appearance of a relatively darker bronchus as compared to adjacent ground glass opacity. If the ground glass opacity progresses to consolidation, air bronchograms will be visualised.
This sign is useful to identify diffuse ground glass opacity on HRCT chest in cases of Pneumocystis jirovecii pneumonia who may present with a normal or equivocal chest radiograph in the early course of the disease 1.
- 1. Yadav P, Seith A, Sood R. The 'dark bronchus' sign: HRCT diagnosis of Pneumocystis carinii pneumonia. Ann Thorac Med. 2007;2 (1): 26-7. doi:10.4103/1817-1737.30359 - Free text at pubmed - Pubmed citation
- 2. Yudin A. Metaphorical Signs in Computed Tomography of Chest and Abdomen. Springer International Publishing. ISBN:B00IXF55WW. Read it at Google Books - Find it at Amazon
- 3. Prokop M, Galanski M. Spiral and Multislice Computed Tomography of the Body. TIS. ISBN:B005TGA7A8. Read it at Google Books - Find it at Amazon