Microvessel density was determined on the basis of vWF and αSMA-positive vessels. The distribution of these markers was observed in the vessels located throughout the stroma, mainly around the glands. Comparing eutopic endometrium and the established endometriotic lesions, there were more positive microvessels (arrows) in the stroma around the glands in endometriosis samples after 15 and 30 days. In contrast, αSMA-positive vessels were more abundant in the lesions after 30 days. Magnification × 400.