these patterns include 1 ) poorly differentiated small round cell cancer , 2 ) malignant cellular blue nevus , 3 ) spindle-cell malignant tumor with lamellar cell ( pseudomeissnerian ) differentiation , 4 ) so-called minimal deviation melanoma , 5 ) heterologous malignant mesenchymal differentiation including rhabdomyosarcoma and liposarcoma , and 6 ) undifferentiated spindle cell cancer .
C0007634
cellular
C0007589
differentiation