A light blue line (LBL) was observed along the edge of a lesion using narrow band imaging under saline injection during bronchoscopy in an 82-year-old patient with a lobulated mass on the left B4. The histopathological diagnosis was hamartoma with ciliated bronchial epithelium, and we speculated that LBL appeared around the ciliated bronchial epithelium.
Keywords: hamartoma; light blue crest; light blue line; narrow band imaging; saline injection.
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