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肺部病变射频消融后MRI和组织病理学改变摘要

Summary of the MRI and histopathologic findings of radiofrequency-ablated lesions in the lung

Phase	Tl-weighted imaging	T2-weighted imaging	Contrast-enhanced T1-weighted imaging	Histopathologic findings
Reproduced with permission from Oyama Y, Nakamura K, Matsuoka T, et al. Radiofrequency ablated lesion in the normal porcine lung: long-term follow-up with MRI and pathology. Cardiovasc Intervent Radiol, 2005, 28(3): 346-353.
Acute
Inner zone	Isointensity	Hypointensity	Non-enhancement	Eosinophilic-staining tissue with pyknotic nuclei
Outer zone	Isointensity	Hyperintensity	Ring-like enhancement	Neutrophilic infiltration, congestion, alveolar fluid collections
Subacute
Inner zone	Hyperintensity	Hypointensity	Non-enhancement	Coagulative necrosis
Outer zone	Isointensity	Hyperintensity	Ring-like enhancement	Granulation with inflammatory infiltration
Chronic
Inner zone	Hyperintensity	Heterogeneous intensity	Non-enhancement	Coagulative necrosis
Outer zone	Isointensity or hyperintensity	Hyperintensity	Ring-like enhancement	Thickened fibrous tissue with inflammatory cells