mainstem
101MERG — Merger (Community » Educational) * Merger Mines Corporation (Business » NASDAQ Symbols) * Mainstem Eel River Group (Community » Non Profit Organizations) …
102RMB — right mainstem bronchus …
103fallen lung sign — a radiographic sign of rupture of the trachea or a mainstem bronchus, in which the collapsed lung sags posteriorly and laterally away from the hilum …
104RMB — • right mainstem bronchus …