Pediatric Angiolipoma

  • Etiology:
    — Soft tissue tumor composed of mature adipocytes and blood vessels
  • Imaging US: Heterogenous and hyperechoic
  • Imaging MRI:
    — Fat tissue with prominent vascular supply
    — Follow signal characteristics of fat and has variable appearance depending on mixture of adipose and vascular elements
    — T1WI: Vascular elements are low signal intensity
    — T1WI post contrast: Vascular elements enhance homogeneously
    — T2WI: Vascular elements are high signal intensity
  • DDX:
  • Complications:
  • Treatment:
  • Clinical:
    — Seen in adolescents
    — Presents as subcutaneous nodules
    — Most commonly seen in extremities

Radiology Cases of Angiolipoma

US and MRI of angiolipoma
Transverse US of the right thigh (above) shows the lesion to be diffusely hyperechoic and well encapsulated. Axial T1 MRI without contrast of the thigh (middle) shows the well enapsulated lesion in the lateral aspect of the right thigh to be slightly hyperintense to muscle and to contain some small flow voids. The mass is extremely hyperintense to muscle and fat on the axial T2 MRI (below).