“Black hole sign”
The bronchus that appears in hour 2 leads to a cavity.
The light emitted by the endoscope is not refracted or reflected in the walls so the bronchus looks like a dark hole.
“Black hole sign”
The bronchus that appears in hour 2 leads to a cavity.
The light emitted by the endoscope is not refracted or reflected in the walls so the bronchus looks like a dark hole.