PMC5778718_01
Relevant coronal sections from single-photon emission computed tomography ventilation-perfusion scan images. (a) Coronal single-photon emission computed tomography ventilation-perfusion image depicts ventilation portion of examination following inhalation of Technegas. (b) Coronal single-photon emission computed tomography ventilation-perfusion image depicts corresponding perfusion portion of examination following intravenous administration of Tc-99m macroaggregated albumin, demonstrating a mismatched perfusion defect within the right lower lobe (red arrow)
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F1
SPECT V/Q scanning demonstrated a mismatched perfusion defect within the posterior basal segment of the right lower lobe [Figure 1].
Coronal section from computed tomographic pulmonary angiogram scan. A feeding arterial vessel (red arrow) arises from the lower thoracic aorta supplying an intralobar bronchopulmonary sequestration within the right lower lobe. This intralobar bronchopulmonary sequestration correlated with the mismatched perfusion defect identified on earlier single-photon emission computed tomography ventilation-perfusion imaging
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F2
However, the region of mismatch seen within the posterior basal segment of the right lower lobe on SPECT V/Q imaging corresponded to an intralobar BPS with an arterial supply arising from the distal thoracic aorta and venous drainage through the pulmonary veins [Figure 2].