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Abstract
Purpose
To evaluate the incidence and volume of the cisterna chyli of gastrointestinal malignancy patients by CT.
Materials and Methods
Contrast enhanced abdominal CT images of gastrointestinal malignancies from 1,421 patients were evaluated. The prevalence of cisterna chyli according to origin of primary tumor was recorded, and the volume of identifiable cisterna chyli was calculated. The average volumes were then compared by the ANOVA method.
Results
The cisterna chyli was found in 352 patients (25.1%). Of these, the incidences by location were hepatocelluar carcinoma, 33.6% (n = 82), biliary carcinoma, 24.6% (n = 42), colon cancer 24.1% (n = 84), pancreatic cancer, 23.6% (n = 17), and gastric cancer, 22.4% (n = 127). The average volume of cisterna chyli was 387 µL, which was calculated from the averages by location as follows: biliary carcinoma 567 µL, colon cancer 536 µL, hepatocellular carcinoma 360 µL, gastric cancer 275 µL, and pancreas cancer 178 µL. No significant difference was found among primary tumors.
Conclusion
Knowing the characteristics of the cisterna chyli is important for differentiating them from metastatic lymph nodes. The cisterna chyli of gastrointestinal malignancies was most commonly found in hepatocellular carcinoma cases. Further, no statistical difference among the volumes of the cisterna chyli or the origin of the primary tumors.
Figures and Tables
Fig. 1
A 82-year-old man with cholangiocarcinoma. The post contrast axial CT (A) shows a round retrocrural structure between the aorta and the right crus of the diaphragm representing cisterna chyli (arrow). Coronal reformatted image (B) shows a fusiform shape with craniocaudal extension.
Fig. 2
A 70-year-old man with CBD cancer. The post contrast axial CT (A) shows a oval retrocrural structure between the aorta and the left crux of the diaphragm representing cisterna chili (arrow). Coronal reformation (B) shows a fusiform shape with craniocaudal extension.
Note.-CBD = common bile duct
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