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Schematic representation of four possible microscopic circumferential resection margins (CRM) measurements in different esophageal cross-sections: a tumor with free CRM, measurement performed in tenths of millimeters; b small tumor with narrow free CRM, damage to the esophageal wall caused by surgical manipulation; c large tumor, directly growing into the CRM; d tumor with satellite (spray) growth into the CRM with few malignant cells
