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Histologic features of the tumor in the lung and pancreas. a) The pulmonary tumor cells had round or oval nuclei, a fine chromatin pattern, and indistinct cytoplasm and nucleoli. Mitotic activity was very high (HE, 400×). b) The pulmonary tumor cells showed a consistent and strong membranous expression of CD99 (SP, 400×). c) Diffusely infiltrative tumor cells were present in the pancreas parenchyma (HE, 200×).
