Ovarian mucinous cystadenoma (15-20% of ovarian tumours) is a usually large and benign tumour. But, as shown in this micrograph, it can present cytologic atypia and infiltrative pattern (mucinous cystic adenocarcinoma).
Light micrograph of a human heart showing several pale areas of a recent infarct. In these areas, there is an ischemic, coagulative necrosis and inflammatory infiltrates of macrophages, suggesting an evolution of at least one week.
Human spleen amyloidosis. Amyloidosis is caused by abnormal folding of normal soluble proteins leading to fibril formation. These clumps of protein are called amyloid deposits. The spleen is involved in most cases of systemic amyloidosis. The microgr