Figure 3.

(A) Macroscopic view of the superior vena cava specimen: the tumour was strictly intraluminal. (B) Histology of a transverse cross section of the tumour demonstrated an intravenous (venous wall [1]) mass obstructing the lumen (2) with lobular architecture and thrombotic re-organisation (3) (haematoxylin and eosin stain [H&E] ×0.70). (C) Close up picture of the mass showed numerous small capillaries (arrows) and larger vessels (black stars) within fibro-oedematous stroma (black triangle) (H&E ×10). (D) At higher magnification, capillaries showed unstratified endothelium without atypia (black arrow), accompanied by inflammatory cells (blue arrow) (H&E ×20).