骨母细胞瘤的MRI诊断价值

目的探讨骨母细胞瘤的MRI表现及其诊断价值。方法9例经病理确诊的骨母细胞瘤术前均行MRI检查并对MRI征象进行分析。结果9例中6例为良性,3例为侵袭性。肿瘤起源于脊柱、颅骨、骨盆分别为5例、3例、1例,MRI上主要表现溶骨性膨胀性骨质破坏,骨样组织在T1WI为低或等信号,T2WI可为低、等或高多种信号成分;肿瘤内钙化或骨化T2WI为低信号,T1WI上为等或低信号;周边硬化环T1WI和T2WI上均为低信号;可伴有软组织肿块;增强扫描骨样组织和软组织肿块中度到明显强化,囊变、硬化边不强化。侵袭性骨母细胞瘤边界不清,可侵犯周围组织。结论MRI能较好显示骨母细胞瘤的各种改变,对诊断、手术定位、分期尤其在显示脊髓和脑内继发改变有重要价值。

Osteoblastoma: the Role of MRI in Diagnosis

Objective To study the MRI characteristics of osteoblastoma and to discuss its diagnostic value. Methods Nine patients with osteoblastoma proved by pathology were examined with T_2WI, nonenhanced T_1WI and Gd-DTPA enhanced T_1WI MR imaging before operation MR finding were analyzed. Results Of nine patients, tumor originated from spine in five patients, from skull in three patients and from pelvis in one patient. Of these patients, benign osteoblastoma were in six patients and malignant were in three patients. On MRI, the tumor was an expanded osteolytic lesion, osteoid production formation was low or equal signal intensity on T_1WI and medial or high signal intensity on T_2WI. MRI showed low signal intensity of the calcification or ossification in osteoblastoma on T_2WI, and low or equal signal intensity on T_1WI. The ossified ring of tumor was low signal intensity on both T_1- and T_2WI. The adjacent soft tissue masses were showed on MRI. All patients given gadolinium showed enhancement within the osteoid production and the adjacent soft tissue mass, and no enhancement with ossification and calcification, cystoid and the ossified ring on MRI. The boundary of malignant osteoblastoma was obscure, and adjacent tissue could be invaded.Conclusion MR imaging can show all the characteristics of osteoblastoma well . It is of important value in diagnosis, operative orientation and staging of osteoblastoma, especially for the lesion originated from spine and skull.