CTICasesSarcomatoid Carcinoma (Giant Cell Subtype) with Obstructive Left Upper Lobe Collapse and Drowned Lung Phenomenon
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Imaging findings
A scout image and CT revealed findings consistent with obstructive left upper lobe collapse, notable for the absence of significant volume loss, termed the 'drowned lung' phenomenon. An obstructing endobronchial lesion was identified, leading to post-obstructive pneumonia with abscess formation within the affected lung parenchyma.
Key takeaways
The 'drowned lung' phenomenon occurs when bronchial obstruction leads to complete filling of the distal airways with fluid or secretions, maintaining lung volume despite collapse. Sarcomatoid carcinoma, particularly the giant cell subtype, is a rare but aggressive bronchial tumor that can cause such obstruction. Diagnosis is confirmed by bronchoscopy and histology showing spindle and/or giant cells, guiding subsequent management.
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