Garland's triad
In radiology, Garland's triad (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. References

External links
 Radiographic images  of Garland's triad. Medical signs