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a Lung perfusion scan showed total absence of perfusion in the right lung. b Lung ventilation scan showed decreased size of the right lung with diminished but homogeneous radioactivity distribution when compared to the left. c Computed tomographic angiography. c1
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Ventilation-perfusion (V/Q) lung scintigraphy has been a popular diagnostic test for evaluation of pulmonary thromboembolism (PE) for almost 40 years. Despite the validation of V/Q scintigraphy, it is important to remember that there are causes of unmatched perfusion defects that are not due to PE. Here, we describe a very rare case of right main p...
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... murmur, etc.). Laboratory examination showed D-dimer negative. Ventilation-perfusion scintigraphy was performed with 99m Tc-diethylenetriaminepentaacetic acid ( 99m Tc-DTPA) aerosol for ventilation phase and 99m Tc-macroaggregated albumin ( 99m Tc-MAA) for perfusion phase. Lung perfusion scan disclosed total absence of perfusion in the right lung (Fig. 1a), while ventilation scan disclosed decreased size of the right lung with diminished but homogeneous radioactivity distribution when compared to the left (Fig. 1b). Despite the non-classical imaging result, this mismatch was interpreted as probable acute PE. However, considering the patient's signs, symptoms and results of laboratory ...
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... Tc-DTPA) aerosol for ventilation phase and 99m Tc-macroaggregated albumin ( 99m Tc-MAA) for perfusion phase. Lung perfusion scan disclosed total absence of perfusion in the right lung (Fig. 1a), while ventilation scan disclosed decreased size of the right lung with diminished but homogeneous radioactivity distribution when compared to the left (Fig. 1b). Despite the non-classical imaging result, this mismatch was interpreted as probable acute PE. However, considering the patient's signs, symptoms and results of laboratory examination, acute PE was suspected and a congenital anomaly of the right lung or proximal pul- monary artery branch stenosis was considered to be an alternative ...
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... lung or proximal pul- monary artery branch stenosis was considered to be an alternative diagnosis. For further evaluation, CTA was performed. The imaging of the CTA demonstrated occlu- sion of the right main pulmonary artery with no evidence of embolus (Figs. 1c1, 2b) and numerous anomalous arteries in transverse section were unexpectedly found (Fig. 1c2). Pulmonary window setting showed decreased size of the right lung (Fig. 2a). Three-dimensional reconstruction demonstrated large, tortuous collateral vessels arising from the left circumflex coronary artery to the affected lung (Figs. 1d, ...
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... of embolus (Figs. 1c1, 2b) and numerous anomalous arteries in transverse section were unexpectedly found (Fig. 1c2). Pulmonary window setting showed decreased size of the right lung (Fig. 2a). Three-dimensional reconstruction demonstrated large, tortuous collateral vessels arising from the left circumflex coronary artery to the affected lung (Figs. 1d, ...
