en قلب Heart گزارش مورد case report <p></p> <div>Kaposiform hemangioendothelioma (KHE) is a rare vascular neoplasm that can be potentially low malignant and mainly affects infants and adolescents. This tumor usually is seen in the skin, soft tissue, and retroperitoneum. This study is a case of KHE in the long bone of the ulna. The subject was a 7-year-old female patient with osteolytic lesion in the forearm without cutaneous lesions. Histologically, the neoplasms comprised of nodules of spindle-to oval-shaped cells that grew in an infiltrative fashion. The results of 2-year follow-up of the patient after enblec resection were desirable and no recurrence was observed. This is the first study to report a case of KHE of the bone in Iran.</div> Bone, Hemangioma, Hemangioendothelioma, Kaposiform 63 65 http://ijpho.ssu.ac.ir/browse.php?a_code=A-10-165-1&slc_lang=en&sid=1 Sam Hajialiloo Sami sami@iums.ac.ir No Bone and Joint Reconstruction Research Center, Shafa Orthopedic Hospital, Iran University of Medical Sciences, Tehran, IR Iran. Azra Izanloo a.izanloo64@gmail.com No Razavi Cancer Research Center, Razavi Hospital, Imam Reza International University,Mashhad, Iran Masoud Mirkazemi masoud.dr2003@gmail.com Yes Bone and Joint Reconstruction Research Center, Shafa Orthopedic Hospital, Iran University of Medical Sciences, Tehran, IR Iran.