Felix George Fleischner (1893 - 1969) was an Austrian radiologist. Eponymously affiliated with the Fleischner sign; one of several described CXR signs of pulmonary embolus
Fleischner sign: prominent dilated central pulmonary artery. Enlargement can be associated with massive embolus enlarging the luminal diameter of the proximal artery in the acute setting; or pulmonary hypertension in the subacute to chronic setting