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Angiographic examinations. (A) Three-dimensional computed tomographic angiography (posterior oblique view) shows complete occlusion of the right distal main pulmonary artery (arrow). (B) pulmonary angiography shows a filling defect occupying the entire lumen of the right distal main pulmonary artery (arrowhead). (C) An endovascular catheter biopsy using forceps is performed following pulmonary angiography.
