Soft Tissue Sarcoma (lymph nodes)

This collection addresses thyroid malignancy, melanoma, and neuroendocrine tumors in pediatric patients, with emerging data on sentinel lymph node techniques. Pediatric thyroid nodules carry higher malignancy risk than adult lesions, and when cancer is present, children more frequently demonstrate extrathyroidal extension, regional nodal involvement, and distant metastasis [e302-c1, e302-c2]. Papillary thyroid cancer shows bilateral disease in up to 30% and multifocal disease in up to 65% of pediatric cases, driving recommendations for total thyroidectomy [e302-c8, e302-c9]. Indeterminate follicular lesions warrant resection in children due to malignancy rates of 28–60%, substantially higher than adult cohorts [e302-c17, e302-c18, e302-c19]. Pediatric melanoma presents with advanced disease: approximately 51% of patients undergoing sentinel lymph node biopsy have positive nodes . Critically, ultrasound observation versus completion lymph node dissection showed no significant difference in recurrence or death, though pediatric-specific data remain limited [e6343-c18, e6343-c10]. Indocyanine green (ICG) demonstrates ~80% sensitivity for sentinel node detection in pediatric skin and soft tissue malignancies, with all malignant nodes being ICG-avid and no adverse reactions reported [e12056-c2, e12056-c3, e12056-c8]. For neuroendocrine appendix tumors, appendectomy alone achieves ~99% survival equivalent to right hemicolectomy, even with larger tumors or positive margins [e10941-c4, e10941-c5].