- Etiology: benign tumor arising from embryonic white fat that contains mature and immature adipocytes and myxocollagenous stroma
- Imaging:
— lipoblastoma is well-circumscribed / superficial / encapsulated
— lipoblastomatosis is infiltrative and non-encapsulated / deep - MRI: some contain very little fat, variable amounts of fibrous septae and myxoid matrix determine appearance, indistinguishable from liposarcoma – rely on age to differentiate
- Complications: metastases rare, locally recurrent (25%)
- Clinical: < 3 years old, second most common fatty tumor in children, 78% in extremity
Pediatric Imaging 