摘要
BACKGROUND Almost half of the patients with colorectal cancer(CRC)will experience localregional recurrence after standard surgical excision.Many local recurrences of colorectal cancer(LRCC)do not grow intraluminally,and some may be covered by a normal mucosa so that they could be missed by colonoscopy.Early detection is crucial as it offers a chance to achieve curative reoperation.Endoscopic ultrasound(EUS)is mainly used in CRC staging combined with cross-section imaging study.EUS can provide an accurate assessment of sub-mucosal lesions by demarcating the originating wall layer and evaluating its echostructure.EUS fineneedle aspiration(FNA)provides the required tissue examination and confirms the diagnosis.CASE SUMMARY We report a series of five cases referred to surveillance for LRCC with negative colonoscopy and/or negative endoscopic biopsies.EUS-FNA confirmed LRCC implanted deep into the third and fourth wall layer with normal first and second layer.CONCLUSION Assessment for LCRR is still problematic and may be very tricky.EUS and EUSFNA may be useful tools to exclude local recurrence.
