A microscopic feature of seminoma include all of the following except -

Microscopic features of Seminoma Sheets of uniform (monomorphic) cells, i.e., seminoma cells, Sheets are divided into poorly demarcated lobules by delicate septa of fibrous tissue. Septa is infiltrated with T- lymphocytes. Sometimes prominent granuloma Seminoma cell has the following features Large and round to polyhedral.                             Distinct cell membrane                                             Clear or watery appearing cytoplasm.                 A large central nucleus with one or two prominent nuclei. Cytoplasm contains glycogen.  Placental alkaline phosphatase and keratin positive.