Malignant ectomesenchymoma (MEM) is a rare, rapidly growing soft tissue tumor composed of mesenchymal and neuroectodermal elements. It usually develops in the pelvis, retroperitoneum, or genitourinary tract of children. According to WHO, MEM is classified among skeletal muscle tumors containing embryonal rhabdomyosarcoma mixed with neuroblastic components, typically positive for desmin, myogenin, and synaptophysin. The tumor most often occurs during the first years of life and is characterized by aggressive behavior. Fewer than one hundred cases have been described worldwide. Read More

Meeting name: SPR 2026 Annual Meeting , 2026

Authors: Osinska Aleksandra, Materniak Andrzej, Wozniak Magdalena

Keywords: Musculoskeletal