Arteriogram: Pulmonary Embolus

An abnormal arteriogram of the right lung. A pulmonary embolus (blood clot), which appears pale, is seen inside a large blood vessel (arrowheads).

(From AP Fishman, Fishman's Pulmonary Diseases and Disorders, 3 ed, 1998, McGraw- Hill, Fig. 34-1; with permission.)