Visualization of the normal pituitary gland during the endoscopic endonasal removal of pituitary adenoma by narrow band imaging.

NBI observation during the endoscopic endonasal removal of pituitary adenoma may be useful for visualizing the normal pituitary gland after the gross removal of the tumor. The absence of a typical vascular pattern suggests the presence of a residual tumor, which may justify further exploration in cases where gross total removal is considered necessary.