Thrombotic Microangiopathy of Pulmonary Tumors: A Vascular Cause of Tree-In-Bud Pattern on CT
Tomás Franquet1,
Ana Giménez1,
Rosa Prats1,
José Manuel Rodríguez-Arias2 and
Carmen Rodríguez3
1 Department of Radiology, Hospital de Sant Pau, Universidad Autónoma de
Barcelona, Avda Sant Antoni Ma Claret 167, 08025
Barcelona, Spain.
2 Department of Respiratory Medicine, Hospital de Sant Pau, Universidad
Autónoma de Barcelona, 08025 Barcelona, Spain.
3 Department of Pathology, Hospital de Sant Pau, Universidad Autónoma de
Barcelona, 08025 Barcelona, Spain.

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Fig. 1A. 48-year-old man with thrombotic microangiopathy of pulmonary
tumor induced by gastric adenocarcinoma. Magnified high-resolution CT images
of both lower lobes obtained using 1-mm collimation and lung window settings
show multiple centrilobular nodules and branching lines with tree-in-bud
appearance (arrows).
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Fig. 1B. 48-year-old man with thrombotic microangiopathy of pulmonary
tumor induced by gastric adenocarcinoma. Magnified high-resolution CT images
of both lower lobes obtained using 1-mm collimation and lung window settings
show multiple centrilobular nodules and branching lines with tree-in-bud
appearance (arrows).
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Fig. 1C. 48-year-old man with thrombotic microangiopathy of pulmonary
tumor induced by gastric adenocarcinoma. Photograph of cut section of lung
from autopsy specimen shows normal interlobular septa (arrowheads)
and pulmonary veins (PV) in periphery of secondary pulmonary lobule. Multiple
branching opacities can be seen in central portion of lobule.
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Fig. 1D. 48-year-old man with thrombotic microangiopathy of pulmonary
tumor induced by gastric adenocarcinoma. Photomicrograph of histopathologic
specimen shows complete arteriolar occlusion by fibrocellular intimal
proliferation. Clumps of tumor cells are visible in recanalized organized
lesion. (H and E, x40)
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Copyright © 2002 by the American Roentgen Ray Society.