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Figure 1 A, Light microscopic specimen (subject no. 243/95). Histologic cross section of a stented coronary artery. Implantation pressures of 15 atm did not produce complete stent expansion. Subacute stent thrombosis after 12 days. Lumen obstructed by thrombotic material (th). Extensive calcification (ca) impeding complete homogeneous stent expansion. S = stent strut. (Magnification x11, reduced by 65%.) B, Gross specimen (subject no. 365/96). Longitudinally dissected coronary artery 11 days after stenting. The endoprosthesis is incompletely covered by a thin, membranous thrombus  . In between stent filaments multiple intramural hematomas can be identified. (Magnification x7.) C, Light microscopic specimen (subject no. 122/95) of a histologic cross section of a coronary artery 28 days after stenting. Stent struts (S) show coating by neointima (n) with few cellular infiltrates. The borderline between neointima and arteriosclerotic plaque (p) is still visible. Lumen (l) filled with contrast medium after postmortem coronary angiography. m = media; a = adventitia. (Magnification x25, reduced by 65%.) D, Gross specimen (subject no. 291/96). Longitudinal section of a coronary artery six months after stent implantation. Stent struts (S) covered by gray neointima. Intercellular hemosiderin pigments as residuals of intramural bleedings (b) caused by the implantation trauma in the outer media. l = lumen. (Magnification x8.5, reduced by 65%.)
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