Morphological assessment of the interface between tumor and neighboring tissues, by magnetic resonance imaging, before and after radiotherapy in patients with locally advanced rectal cancer.

Torkzad MR; Suzuki C; Tanaka SPalmer GHolm T Blomqvist L

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Morphological assessment of the interface between tumor and neighboring tissues, by magnetic resonance imaging, before and after radiotherapy in patients with locally advanced rectal cancer.

机译：Morphological assessment of the interface between tumor and neighboring tissues, by magnetic resonance imaging, before and after radiotherapy in patients with locally advanced rectal cancer.

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BACKGROUND: Magnetic resonance imaging (MRI) in rectal cancer is sometimes performed after radiotherapy (MRI 2) to evaluate tumor response and to choose alternative forms of surgery. The accuracy of MRI 2 in distinguishing tumor delineation might be difficult due to fibrosis. PURPOSE: To evaluate the morphological changes in the interface between the tumor and neighboring organs on MRI 2 performed after radiotherapy, and to assess the accuracies of MRI before and after radiotherapy compared to histopathology after surgery. MATERIAL AND METHODS: Sixteen patients with locally advanced primary rectal cancer, with MRI before and after radiotherapy, were retrospectively studied, concerning the interface between the tumor and neighboring structures. The accuracies of MRI before and after radiotherapy were compared based on histopathology as a reference. RESULTS: The accuracies of both MRI before and after radiotherapy were moderate, with no additional value of MRI after radiotherapy compared to MRI before radiotherapy. The most predictive form of interface for involvement of a neighboring organ after radiotherapy was nodular growth of the tumor into a neighboring structure. CONCLUSION: The morphological assessment of pelvic MRI after preoperative radiotherapy does not provide any significant new information about tumor extent in patients with locally advanced rectal cancer.

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《Acta Radiologica》 |2008年第10期|1099-1103|共5页
作者
Torkzad MR; Suzuki C; Tanaka SPalmer GHolm T Blomqvist L;
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Department of Radiology, Uppsala University Hospital, Uppsala, Sweden. mictor@ki.se;

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正文语种英语
中图分类放射医学;
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Female; Follow-Up Studies; Humans; Magnetic Resonance Imaging; Male; Middle Aged; Neoplasm Invasiveness; Neoplasm Staging; Observer Variation; Pelvic Neoplasms; Pelvis; Predictive Value of Tests; Rectal Neoplasms; Rectum; Reproducibility of Results; Retrospective Studies; Sensitivity and Specificity; Severity of Illness Index; *随访研究; 磁共振成像; 肿瘤侵润; 肿瘤分期; 观察者偏差; 盆腔肿瘤; 骨盆; 试验预期值; 直肠肿瘤; 直肠; 可重复性; 结果; 回顾性研究; 易感性与特异性; 疾病严重程度指数;

Morphological assessment of the interface between tumor and neighboring tissues, by magnetic resonance imaging, before and after radiotherapy in patients with locally advanced rectal cancer.

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