MR Images of Thymoma and Their Correlation with Pathologic Findings.

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To evaluate the effectiveness of MR imaging for diagnosing thymomas and differentiating non-invasive from invasive thymomas, MRI was performed in twenty-five patients with thymoma and the MR appearances were compared with the pathological findings.<BR>The MR appearances of thymomas corresponded well with the pathological findings: intratumoral linear septae of low signal intensity were fibrous septae and nodular images were lobules with tumor cells, necrosis or hemorrhage. Coronal and sagittal images provided additional useful information concerning tumor extent.<BR>Invasive thymomas tend to have irregular margins, larger size, more cranio-caudal extent and internodular differences in signal intensity (IDSI) on MR images than noninvasive thymomas. Among them, IDSI is the best differential diagnostic finding to determine invasiveness.<BR>Gd-DTPA enhanced MRI in thymomas showed intratumoral linear septae and necrotic lesions more clearly than the plain Tl-weighted image.
特定非営利活動法人日本肺癌学会の論文