不明原发灶骨转移癌的治疗是骨肿瘤治疗中重要而棘手的问题。本文作者分析了大阪大学医学部及相关医院17年来的16例病例。 患者初诊年龄为40～76(平均62)岁。男性7例,女性9例。13例主诉有疼痛。转移部位12例为脊椎、5例为股骨、3例为肋骨、5例为骨盆、2例为颅骨,胸骨及肩胛骨各1例。12例为多发性骨转移,4例伴有骨外转移。四肢骨转移几乎均有溶骨性变化,12例脊椎转移有类 The treatment of unidentifiable primary metastatic bone cancer is an important and thorny issue in the treatment of bone tumors. The author of this article analyzed 16 cases from the University of Osaka Medical School and related hospitals over the past 17 years. The initial age of the patient was 40-76 (mean 62) years old. There were 7 males and 9 females. Thirteen patients complained of pain. The metastatic sites were 12 cases of spine, 5 cases of femur, 3 cases of ribs, 5 cases of pelvis, 2 cases of skull, and 1 case of sternum and scapula. Twelve patients had multiple bone metastases and four patients had extrabony metastases. Almost all bone metastases have osteolytic changes, 12 cases of spinal metastasis