[Cytogenetic features of the differential diagnosis of lymphoid thymomas, small-cell non-Hodgkin lymphomas and undifferentiated small cell lung carcinoma].

The predominance of compact and nucleolonemic types of nucleoli in undifferentiated small cell carcinoma of lung, the prevalence of micronucleoli and ring-shaped types of nucleoli in lymphoid thymoma and the increase of the level of micronucleoli in small cell non-Hodgkin's lymphoma have been established.