![]() ![]() We performed a retrospective review of 45,000 posteroanterior chest radiographs to determine the frequency of appearance and characteristics of perihilar linear atelectasis. We propose an early roentgen sign of obstructing lung tumors, namely perihilar linear atelectasis, and ascertain whether this phenomenon could be used as a sign to detect radiographically occult primary lung cancer. Linear atelectasis may occur as a consequence of subsegmental bronchial obstruction. Linear atelectasis is a focal area of subsegmental atelectasis with a linear shape.
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