Lipoblastoma - perineal

Case contributed by Francis Fortin

Presentation

Soft perineal mass noted in first weeks of life, slowly enlarging over time.

Patient Data

Age: 2 years
Gender: Male
ultrasound

Well-defined homogenous echogenic subcutaneous mass in the left perineal region, without visible internal Doppler flow.

mri

Well-defined subcutaneous mass in the left perineum with high T1WI signal saturating out on water-only DIXON sequence, suggesting fat content. No significant enhancement. Areas of internal mildly elevated T2WI signal.

Case Discussion

Imaging findings in this young patient are highly suggestive of a lipoblastoma. Though similar imaging caracteristics in an adult might be worrisome for atypical lipoma or well-differentiated liposarcoma, these almost never occur in children.

Percutaneous biopsy confirmed a lipoma-like subtype of lipoblastoma.

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