spermatocytic seminoma (MONDO_0020513) is a rare variant of seminoma characterized by the presence of three cell types: round cells with eosinophilic cytoplasm, small cells with dark nucleus and a small amount of cytoplasm, and mono-or multinucleated giant cells. The neoplastic cells are not cohesive. There is an edematous stroma present; lymphocytic infiltrates are rarely seen. Most patients are older males. Also known as: testicular spermatocytic seminoma.