June 2016 A 72-year old male presents to his primary care physician with fatigue, abdominal pain lasting 3 months, and night sweats PMH includes depression and gout Physical Exam: BP, 155/85; spleen palpable 6 cm below costal margin Laboratory values: Hb= 9.8 g/L HCT= 38% WBC= 22.3 x109/L Platelets= 255 x109/L Bone marrow biopsy: Megakaryocytic proliferation and atypia with evidence of reticulin fibrosis Blood smear showed leukoerythroblastosis Genetic testing showsJAK2 V617Fmutation Diagnosis: Primary myelofibrosis