The primary tumors of five cases were in cephalofacial site, 12 in limbs and trunk, 24 in genito-urinary system, and 14 in splanchnocoele, respectively.

• 肿瘤部位：原发于头面部5例，四肢和躯干部12例，生殖泌尿系统24例，胸腹腔14例。