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Figure 4 In this example, correlation between thallium scintigraphy, gross pathology and histomorphology is shown. Thallium stress, redistribution and reinjection images are shown at the top with corresponding gross pathology and histomorphology of a midventricular slice on the bottom. On the thallium study, there are extensive thallium abnormalities in the anterior, septal and inferolateral regions during stress. On the redistribution image, there is partial reversibility of the anterior region, complete reversibility of the septum and irreversible defect in the inferolateral region. After thallium reinjection, there is complete reversibility of the septal and anterior regions with persistent irreversible defect in the inferolateral region. On gross pathology, there is white fibrotic myocardium in the inferolateral region, and histomorphologic analysis shows a significant amount of red-stained collagen intermixed within normal looking myocytes in the same area.