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×).
Shi et al. Diagnostic Pathology 2013 8:51 doi:10.1186/1746-1596-8-51