pulmonary embolism westmark sign: focal area of oligemia

Landmark Investigations
Remy-Jardin/Teigen etal 1992 CT Diagnosis
PIOPED 1990 Prospective Study
Hull et al 1983 Prospective Study
Biello et al 1979 Probability classification
UPET 1970 Treatment
Wagner 1964 Radioisotope scanning
Williams etal 1963 Angiography
Westermark 1938 Roentgen diagnosis