Recently, endoscopic screening systems have enabled the diagnosis of gastric cancer in the early stages. Early gastric cancer (EGC) is typically characterized by a shallow invasion depth and small size, which can hinder localization of EGC tumors during laparoscopic surgery. Here, we review nine recently reported tumor localization methods for the laparoscopic resection of EGCs. Preoperative dye or blood tattooing has the disadvantage of spreading. Preoperative 3-dimensional computed tomography reconstruction is not performed in real time during laparoscopic gastrectomy. Thus, they are considered to have a low accuracy. Intraoperative portable abdominal radiography and intraoperative laparoscopic ultrasonography methods can provide real-time feedback, but these methods require expertise, and it can be difficult to define the clips in some gastric regions. Despite a few limitations, intraoperative gastrofibroscopy provides real-time feedback with high accuracy. The detection system using an endoscopic magnetic marking clip, fluorescent clip, and radio-frequency identification detection system clip is considered highly accurate and provides real-time feedback; we expect a commercial version of this setup to be available in the near future. However, there is not yet an easy method for accurate real-time detection. We hope that improved devices will soon be developed and used in clinical settings.

中文翻译：

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早期胃癌的术中肿瘤定位。

最近，内窥镜检查系统已使早期诊断出胃癌成为可能。早期胃癌（EGC）的典型特征是浸润深度浅，体积小，这可能会阻碍腹腔镜手术期间EGC肿瘤的定位。在这里，我们回顾了EGC的腹腔镜切除术的九种最近报道的肿瘤定位方法。术前染或血液纹身有扩散的缺点。腹腔镜胃切除术期间不能实时进行术前3D计算机断层扫描重建。因此，它们被认为具有较低的准确性。术中便携式腹部X线摄影和术中腹腔镜超声检查方法可以提供实时反馈，但是这些方法需要专业知识，并且可能难以在某些胃区域中定义夹子。尽管有一些限制，但术中胃纤维镜检查仍可提供高精度的实时反馈。使用内窥镜磁性标记夹，荧光夹和射频识别检测系统夹的检测系统被认为具有很高的准确性，并提供实时反馈；我们预计此设置的商业版本将在不久的将来提供。但是，还没有一种简单的方法可以进行准确的实时检测。我们希望改进的设备将很快被开发出来并用于临床环境。射频识别检测系统剪辑被认为是高度准确的，并提供实时反馈；我们预计此设置的商业版本将在不久的将来提供。但是，还没有一种简单的方法可以进行准确的实时检测。我们希望改进的设备将很快被开发出来并用于临床环境。射频识别检测系统剪辑被认为是高度准确的，并提供实时反馈；我们预计此设置的商业版本将在不久的将来提供。但是，还没有一种简单的方法可以进行准确的实时检测。我们希望改进的设备将很快被开发出来并用于临床环境。