Fine needle spleen aspirates from 18 cases of uncomplicated polycythaemia vera, 9 of which had splenomegaly, were scrutinized in retrospect. Only in one of these specimens were a few normoblasts and myelocytes found; in the remaining 17 cases no trace of myeloid metaplasia could be detected. The only conspicuous abnormality observed in this material was a very high number of platelets observed in most of the aspirates.
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Berg et al. (1973) studied this question.
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