In radiology,<unk>  (also known as the 1-2-3 sign) is the concurrence of reasonably symmetrical bilateral hilar lymphadenopathy and right paratracheal lymphadenopathy seen on a chest radiograph. These features are suggestive of thoracic sarcoidosis.
Garland's triad
Virchow's triad
Murphy's triad
Saint's triad
Rigler's triad
Charcot's neurologic triad
Kanavel's cardinal signs
Hutchinson's triad