This volume gives a general summary of the current understanding of lymphatic metastasis and the possibilities of more specific detection of lymph node metastasis. It describes in detail the procedure of sentinel lymph node detection in urogenital tumors, neck and thyroid tumors, malignant melanoma, gastric and colorectal cancer and tumors of the breast. The potential and limitations of this new method are discussed. This book provides comprehensive insight into a both clinically and scientifically important new field which is bringing about a marked improvement in the treatment of malignant tumors.