Determining the treatment strategy for colorectal neoplastic lesions: endoscopic assessment or the non-lifting sign for diagnosing invasion depth?

BACKGROUND AND STUDY AIMS

Assessment of the invasion depth of colorectal neoplasia is important in deciding between endoscopic and surgical resection treatment methods. Prior to attempting endoscopic resection, the lesion is lifted by submucosal injection, and a positive "non-lifting sign" is usually considered to indicate deeper submucosal infiltration. The purpose of this prospective multicenter study was to assess the predictive value of the non-lifting sign for differentiating between adenoma and early cancer (up to discrete submucosal infiltration [sm1]) and cancer with deeper infiltration (sm2).

PATIENTS AND METHODS

During an 11-month period, a total of 271 colorectal neoplastic lesions in 239 patients were included in the study. Apart from the location, size, and macroscopic type of the lesion, the presence or absence of the non-lifting sign was recorded and compared with the endoscopic assessment of invasion depth.

RESULTS

The non-lifting sign had a sensitivity of 61.5 %, a specificity of 98.4 %, a positive predictive value of 80.0 %, a negative predictive value of 96.0 %, and an accuracy of 94.8 %. Endoscopic diagnosis of deeper infiltration had a sensitivity of 84.6 %, a specificity of 98.8 %, a positive predictive value of 88.0 %, a negative predictive value of 98.4 %, and an accuracy of 97.4 %. Statistically significant differences were found in terms of sensitivity and accuracy.

CONCLUSION

Because of its lower sensitivity and accuracy, the non-lifting sign will not replace endoscopic assessment. If a lesion does not lift, this can make resection technically difficult, but does not reliably predict deeper cancerous invasion.

Visualization of pancreaticobiliary reflux in anomalous pancreaticobiliary junction by secretin-stimulated dynamic magnetic resonance cholangiopancreatography

PURPOSE

To assess the utility of secretin-stimulated dynamic MR cholangiopancreatography (MRCP) for the visualization of pancreaticobiliary reflux in patients with anomalous pancreaticobiliary junction (PBJ).

MATERIAL AND METHODS

Ten controls and seven patients diagnosed as having anomalous PBJ were prospectively examined by dynamic MRCP after secretin injection using a breath-hold, single-shot turbo spin-echo T2-weighted sequence. The optimal MRCP section was repeated 35 times at approx. 10-second interval after secretin injection; the acquisition time was 4 s per image. The signal intensity (SI) changes of the extrahepatic and intrahepatic bile ducts, presence or absence of intraluminal signal void, caliber change of the bile duct, duodenal filling, and peak time of the SI ratio of the extrahepatic bile duct after secretin injection were compared between the controls and patients.

RESULTS

In the controls, the extrahepatic and intrahepatic bile ducts showed neither enhancement nor caliber change over the observation period, providing no apparent peak time. Of the seven patients, the extrahepatic bile duct showed retrograde enhancement and sequential delay in occurrence of the peak time from its distal third to its proximal third (n = 6) with a signal void in its distal part (n =4); its caliber increased subsequently to pancreatic secretion (n = 5); the intrahepatic bile ducts showed a slight enhancement following SI increase of the proximal extrahepatic bile duct (n = 6); duodenal filling grade tended to be lower in the patients than volunteers (P<.005).

CONCLUSION

In patients with anomalous PBJ pancreaticobiliary reflux were demonstrated by dynamic secretin-stimulated MRCP.