Usefulness of Magnifying endoscopy using NBI system at analcanal lesion

Abstract

We investigated usefulness of magnifying endoscopy using NBI system in the diagnosis of analcanal lesions. Subjects of this study were three endscopic lesions, dysplasia, condyloma, and early squamous cell carcinoma (early SCC) , diagnosed by colono scopy at Tokyo Metropolitan Cancer Detection Center. All of these lesions were a IIa type or IIb type and slightly whitish. Especially it was difficult to find dysplagia because of its flat and smooth surface and its unclear margin. But magnifying endoscopy using NBI system was useful in the diagnosis of existence, because it revealed capillaries similar to irregular IPCL (intra-epithelial papillary capillary loop) of esophagus and pharynx. Condyroma revealed luster, whitish, minute glanules. Magnifying endoscopy using NBI system confirmed brownish capillaries in each glanules like papillary growth. Early SCC was difficult to distinguish from adenoma and adenocarcinoma. Because it existed nearby the dentalline, and its surface was minute. Magnifying endoscopy using NBI system visualized irregular capillaries and caliber varieation. We could, therefore, diagnosed a small lesion as squamous cell carcinoma. We concluded that magnifying endoscopy using NBI system was useful in the diagnosis of analcanal lesion.