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Retroperitoneal and deep‐seated lipoblastoma: Diagnosis by CT scan and fine‐needle aspiration biopsy

Lipoblastomas are most commonly superficially‐located tumors. Our experience with three examples of deep‐seated lipoblastomas is reported. The CT scans of all cases showed low‐attenuation densities (less than 0 Hansfield units), strongly suggesting fatty composition. Fine‐needle aspiration biopsy (FNAB) smears contained uni‐ and multivacuolated lipoblasts, myxoid areas, and a plexiform capillary network. The combination of CT scan and FNAB findings seems to be enough for definitive preoperative diagnosis of lipoblastoma, allowing differential diagnosis with other deep‐seated tumors. Diagn. Cytopathol. 1999;20:295–297. © 1999 Wiley‐Liss, Inc.