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Pulmonary Metastasis from Rectal Cancer on Chest CT Is Correlated with 3T MRI Primary Tumor Location  

Han, Na-Yeon (Department of Radiology, Anam Hospital, Korea University College of Medicine)
Kim, Min-Ju (Department of Radiology, Anam Hospital, Korea University College of Medicine)
Park, Beon-Jin (Department of Radiology, Anam Hospital, Korea University College of Medicine)
Sung, Deuk-Jae (Department of Radiology, Anam Hospital, Korea University College of Medicine)
Chung, Kyoo-Byung (Department of Radiology, Anam Hospital, Korea University College of Medicine)
Oh, Yu-Whan (Department of Radiology, Anam Hospital, Korea University College of Medicine)
Publication Information
Journal of the Korean Society of Radiology / v.65, no.2, 2011 , pp. 151-159 More about this Journal
Abstract
Purpose: To evaluate the association between the incidence of pulmonary metastasis on chest CT and the location of the primary tumor on rectal MRI. Materials and Methods: One hundred and nine consecutive patients with rectal adenocarcinoma underwent chest CT and 3T rectal MRI. Two radiologists classified the tumor on MRI as an upper (> 10 cm from the anal verge), mid (5-10 cm), or lower rectal tumor (< 5 cm) by consensus. All chest CT scans were retrospectively reviewed for the presence of metastasis. We used Fisher's exact test to evaluate the correlation between the incidence of pulmonary metastasis with the location of the rectal cancer and the Mantel-Haenszel test to control for local tumor stage. Results: We only included the 60 patients with upper (n = 26) or lower (n = 34) rectal cancer, because of the complicated venous drainage system of the mid rectum. Among these, 9 (15%) showed evidence of pulmonary metastasis on chest CT and almost all (89%, 8/9) patients had lower rectal cancer. The incidence of pulmonary metastasis between the two groups was statistically different (p < 0.05) when local tumor stage was controlled. Conclusion: The incidence of pulmonary metastasis was significantly higher for lower than upper rectal cancers when the T-stage of the tumor was accounted for.
Keywords
Rectal Neoplasm; Magnetic Resonance Imaging; Neoplasm Metastasis;
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