Recurrent Episodes of Angioedema as Presenting Feature of JAK2-Positive Myeloproliferative Disorder Consistent with Polycythaemia Vera

Polycythaemia vera (PV) is one of the chronic myeloproliferative neoplasms, which are collectively characterised by clonal proliferation of myeloid cells with variable morphologic maturity and haematopoietic efficiency. PV is distinguished clinically from other myeloproliferative neoplasms by the presence of an elevated red blood cell mass because of uncontrolled red blood cell production. This is accompanied by increased white blood cells and platelet production, which is because of abnormal clone of haematopoietic stem cells with increased sensitivity to the different growth factors for maturation. PV can present with variable symptoms because of impaired oxygen delivery caused by slugging of blood, such as headaches, dizziness, vertigo, tinnitus, visual disturbances, and angina pectoris. Some patients present with bleeding complications (1%); another 1% of patients present with thrombotic complications. It is uncommon for patients with myeloproliferative disorders to present with features of angioedema. There are many reported cases in the literature that describe the relationship between the occurrence of angioedema and lymphoproliferative diseases; however, there are no reported cases describing instances of myeloproliferative neoplasm with angioedema. In this article, the authors have studied a case of a 53-year-old male who presented with recurrent episodes of features that are suggestive of angioedema. He was diagnosed with JAK2-positive myeloproliferative disorder consistent with PV; this is the first reported case in Jordan.