CTICasesAdenocarcinoma in retrotracheal clear space
Imaging findings
CT chest shows a left upper lobe pulmonary nodule located directly behind the first costochondral junction. The nodule was extremely difficult to identify on radiographs due to bone overlap in the retrotracheal clear space.
Key takeaways
Raider's triangle (retrotracheal clear space) is a classic 'blind spot' on chest radiographs. Lesions in this region (such as apical lung adenocarcinomas) are easily obscured by overlying ribs, clavicles, or spinal structures, requiring careful evaluation of the lateral view or CT.
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