Presentation
Shortness of breath with chest tightness .
Patient Data
Posterior atelectasis in the left lower lobe, lungs and pleural space are otherwise clear. The heart is enlarged. No pneumothorax or subphrenic free gas.
RADIOPHARMACEUTICAL: 99mTc Gas, 40 MBq / 99mTc MAA, 173 MBq
TECHNICAL PROCEDURE AND RESULTS Routine SPECT ventilation and perfusion scans of the lungs were performed. Images were compared with chest x-ray. Segmental or subsegmental unmatched perfusion defects are seen within the right middle lobe/anterior segment of right upper lobe and the posterior basal segment of the right lower lobe. Subsegmental matched ventilation-perfusion defect is seen within the posterior basal segment of the left lower lobe, in keeping with bronchopulmonary disease, and correlating with similar findings on chest x- ray of atelectasis or consolidation at this site (best seen on the lateral view).
IMPRESSION Positive study for segmental or subsegmental pulmonary embolism situated within the right middle lobe/anterior segment of the right upper lobe and the posterior basal segment of the right lower lobe.
Case Discussion
This case illustrates an even distribution of radionuclide throughout the lung fields with multiple bilateral perfusion defects consistent with pulmonary embolism.