1·Objective To investigate the imaging findings of extramedullary hematopoiesis in mediastinum (EMH), and to improve the diagnostic level of EMH.
目的探讨纵隔髓外造血组织增生（EMH）的影像表现，提高影像诊断水平，减少误诊。
2·Objective: To evaluate MRI diagnosis value of subdural extramedullary tumors.
目的：评价MRI对髓外硬膜下肿瘤的诊断价值。
3·Objective: To evaluate the usefulness of low-field MRI in diagnosing intradural extramedullary tumors in the spinal canal.
目的探讨低场强MRI对椎管内髓外硬膜下肿瘤的临床诊断价值。
4·Objective to summarize the clinical features of extramedullary plasmacytoma (EMP) in the head and neck, and to improve the abilities of clinical diagnosis and treatment for the disease.
目的总结头颈部髓外浆细胞瘤的临床特点，以提高临床诊治水平。