Fig. 2
From: Mediastinal gray zone lymphoma in a pregnant woman presenting with cardiac tamponade
Mediastinal mass pathology A, B Microscopic examination (H&E staining) shows diffuse and nodular infiltration of lymphocytes, neutrophils, eosinophils and some large atypical cells with enlarged hyperchromatic nuclei with irregular contour and prominent nucleoli in fibrotic stroma. C All lymphoid cells including some large atypical cells are positive for CD45. D Many large atypical cells are positive for CD20. E Many small lymphocytes are positive for CD3. F Large atypical cells are negative for CD15. G Large atypical cells are positive for CD30. H Large atypical cells are strongly positive for PAX5)