RT Journal Article SR Electronic T1 Extramedullary haematopoiesis presenting as a periportal mass JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e235064 DO 10.1136/bcr-2020-235064 VO 13 IS 7 A1 Faranak Rafiee A1 Sara Haseli A1 Seyed Hamed Jafari A1 Pooya Iranpour YR 2020 UL http://casereports.bmj.com/content/13/7/e235064.abstract AB Extramedullary haematopoiesis (EMH) is defined as haematopoiesis occurring in organs outside the bone marrow. The liver is one of the rare sites of EMH, and to the best of our knowledge, a few cases of adult EMH of the liver have been reported in the last 20 years. Here, we reported the case of a 68-year-old man with a known history of myelofibrosis presented with vague abdominal pain. An abdominal CT scan showed a hypoattenuating periportal mass encasing the portal vein. The final diagnosis of EMH was made through the histopathological examination. This is a rare presentation of EMH, which may be easily mistaken for other pathologies such as metastases. Familiarity with this type of presentation aids in correctly diagnosing it in an appropriate clinical setting.