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F-18 FDG uptake in bilateral pulmonary artery leiomyosarcomata, one mimicking a pulmonary embolus.

A 53-year-old woman was admitted for investigation of a 3-month history of increasing shortness of breath, cough, and hemoptysis. She had previously undergone a hysterectomy for uterine leiomyomata. A computed tomography scan was performed to exclude a pulmonary embolus and demonstrated an atypical intraluminal filling defect involving the right pulmonary artery and an exophytic mass arising from the left pulmonary artery. FDG PET was performed for further evaluation. Both intraluminal and exophytic mass lesions showed intense tracer uptake and on biopsy were proven to be pulmonary artery leiomyosarcomata.