Why the study?
Does pericardial effusion widen the subcarinal angle on chest radiographs?
Does pericardial effusion widen the subcarinal angle on chest radiographs?
A widened subcarinal angle on a chest radiograph, in the absence of left atrial enlargement, may serve as a clinical clue for unsuspected pericardial effusion.
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May flag unsuspected pericardial effusion on radiographs; leaves open prospective validation before clinical adoption.
Chen et al. (1982) studied this question.