Epidemiology
A benign fatty tumor of infants and young children, most common in the limbs and superficial trunk. In a pediatric fatty mass, confirming that it is benign avoids confusing immature fat with a more aggressive adipocytic tumor.
Basic features
It presents as a lobulated, soft, progressively growing mass; on MRI it may show immature fat and internal septa.
Usual treatment
Complete resection is indicated when it grows, causes discomfort, or leaves diagnostic doubt; a biopsy is planned if the imaging is not typical.
Outcomes and prognosis
The prognosis is excellent, although it can recur if residual lesion remains, especially in diffuse forms.