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Lymph node infiltration by monoclonal plasma cells can occur either in aggressive forms of myeloma or may represent regional extension of extramedullary plasmacytomas, whereas lymph node plasmacytoma presenting as a solitary extramedullary plasmacytoma is very unusual. We report two cases of lymph node plasmacytomas without systemic disease diagnosed after surgical excision. Clinical remission was achieved after local radiotherapy although one patient relapsed with multifocal extramedullary plasmacytomas 20 months after radiotherapy.

Ph-negative chronic myeloproliferative disorders (Ph(neg)cMPD) are treated according to the estimated vascular risk. The recent discovery of V617F point mutation of the JAK2 kinase, which frequently occurs in these diseases, has not changed their management so far. However, emerging data tend to support a prothrombotic role for the mutation, along with a better response of JAK2V617F mutated patients to hydroxyurea treatment. Our data further support this notion.