Infantile Fibrosarcoma

  • Etiology: spindle cell tumor
  • Imaging: heterogeneous soft tissue mass with hemorrhagic / necrotic / fibrous / cystic components, may have higher flow vessels mimicking infantile hemangioma
  • MRI: well demarcated, T1WI isointense to muscle, T2WI heterogenously hyperintense, heterogenous enhancement
  • Complications: low rate of metastases (8%) + high long term survival unlike fibrosarcoma in adults, local recurrence so need to do wide excision
  • Clinical: rapidly growing, most common soft tissue sarcoma in < 1 year old, mostly in neonates and usually in < 2 yo, > 70% in extremities, 60% in lower extremities

Radiology Cases of Infantile Fibrosarcoma

US and CT of infantile fibrosarcoma
Sagittal US of the mass (above) revealed increased vascularity peripherally and central ulceration. Axial and sagittal CT with contrast of the chest (below) shows a mass arising near the right scapula of heterogenous density with variable enhancement.

Clinical Cases of Infantile Fibrosarcoma

Clinical image of infantile fibrosarcoma
Clinical image shows a large mass in the upper right back with overlying skin necrosis.