Imaging of Soft Tissue Tumors in the Pediatric Patient.

The presence of a soft tissue mass in children is of concern to parents and physicians. Fortunately, these masses are rare and usually benign or pseudotumoral. When dealing with malignant soft tissue tumors, therapeutic options and long-term survival are strongly related to the disease stage at the time of diagnosis. Therefore, when children present with indeterminate or persisting symptoms and posttraumatic, metabolic, or infectious disorders have been ruled out, one should perform dedicated imaging studies (conventional radiography, computed tomography [CT], or both; sonography; magnetic resonance [MR] imaging) to exclude the possibility of a nonpalpable soft tissue mass or to characterize the mass when present. An overview of the use of the different imaging modalities for evaluating soft tissue tumors in the pediatric patient is presented. Because of the numerous benign, malignant, and pseudotumoral soft tissue masses that are often encountered in children, clinical, histologic, and imaging features are presented as concise tables.