髓外造血组织增生的CT和MRI影像特征

CT and MRI diagnosis of extramedullary hematopoiesis

目的:探讨髓外造血组织增生的CT和MRI影像特征,提高髓外造血组织增生的影像诊断水平,减少误诊。方法:采用CT及MRI对5例病理学确诊的EMH进行影像学分析。结果:3例EMH发生于中下胸段椎管,呈纵行波浪状软组织块影;1例病灶发生在纵隔两侧,邻近肋骨头膨大;1例EMH表现为胸壁内侧多发半圆形软组织块影。本组髓外造血灶MRI平扫为T1WI等信号、T2WI稍高信号,CT及MRI增强扫描均呈明显均匀强化。CT显示椎体呈栅栏样改变。MRI-T1WI可见脊椎信号弥漫性、均匀性减低。结论:EMH的CT和MRI的影像特征较明显,结合临床可作出影像学诊断。

Objective.. To investigate extramedullary hematopoiesis（EMH） of the CT and MRI features, improve the diagnosis level of extramedullary hematopoietic tissue hyperplasia, and reduce misdiagnosis. Methods.5 pathologic diagnosis of EMH were analysed by CT and MRI. Results-3 cases of EMH occurred in the lower thoracic spinal canal, showing the longitudinal wave-like soft tissue shadow 1 case was in the mediastinum on both sides, and the rib head enlargementl 1 case EMH showed multiple semicircular soft tissue shadow inside the chest wall. The foci of EMH showed a significantly homogeneous enhancement on CT and MRI enhancement scans. CT scan showed a fence-like change in the vertebral body. Vertebral signal was diffuse and uniformity reduced on MRI-T1WI. Conclusion：EMH have special CT and MRI findings, it can be diagnosed by considering its CT and MRI findings and clinical manifestations.