Fig. 3

Microscopic features of the intestinal tumor. a The intestinal wall were infiltrated by pleomorphic tumor cells with sheet-like pattern (HE × 40); b c The neoplastic cells were mainly medium to large size with moderate pale cytoplasm, hyperchromatic nuclei and prominent nucleoli. “Hallmark” cells were easily found. Reed-Sternberg cell-like cell can be detected (HE × 400); d Tumor cell showed nuclear and cytoplasmic staining for ALK; Tumor cells were positive for CD30 e CD5 f TIA-1 i negative for CD4 g CD8 h (Envision × 100); j Ki67 staining showed almost 80 % proliferation index (Envision × 100)