MCQ PULMONARY EMBOLISM

6.Radiographic signs of pulmonary embolus (not causing infarction) are all except
a. Localized peripheral oligaemia (Westermark's sign)
b. Peripheral airspace opacification due to haemorrhage
c. Hampton's hump
d. Linear atelectasis due to surfactant deficiency
e. dilated central pulmonary artery
ANS 6----c (CHAPTER 6,G)
7.Radiographic signs more associated with infarction in pulmonary embolism are all except
a. A pleurally based, wedge-shaped opacity (Hampton's hump)
b. Consolidation  predominantly in the lower lobes
c. resolution of parenchymal changes taking  considerably longer (weeks to months)
d. Cavitation and haemorrhagic pleural effusion
e. Localized peripheral oligaemia (Westermark's sign)
ANS 7---e (CHAPTER 6 ,G)
8.All are true regarding perfusion scintigraphy except
a. injection of microparticles (10–100μm) of ^99mTc micro-aggregate albumin (MAA)
b. the patient  standing  during examination
c. micro-embolize in the lung
d. the radioactivity detected using a gamma camera provide a map of pulmonary blood flow
e. The effective dose to the patient  is less than 1 mSv
ANS 8----b

The patient remain  supine during the examination to maximize flow to the lung apices. (CHAPTER 6 ,G)