Retroperitoneal well-differentiated inflammatory liposarcoma: a diagnostic dilemma.
We present a case of retroperitoneal well-differentiated inflammatory liposarcoma that was extremely difficult to diagnose preoperatively. Computed tomography and magnetic resonance images showed a 5-cm homogeneous soft-tissue mass with a decreased apparent diffusion coefficient and without fat component in the retroperitoneum. Minimal fat stranding was detected around the mass. The preoperative working diagnosis was malignant lymphoma or inflammatory pseudotumor, whereas the final diagnosis after surgery was well-differentiated inflammatory liposarcoma. As a result, only a large component of lymphoid infiltration was recognized as a tumor preoperatively, and minimal fat stranding represented a component of lipoma-like liposarcoma. In this entity, a lipomatous component could easily be missed on radiologic imaging because of the conspicuity of lymphoid infiltration. We should consider the possibility of this variant when we evaluate a retroperitoneal tumor.
Kawano
Rinsaku
R
Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
Nishie
Akihiro
A
Yoshimitsu
Kengo
K
Irie
Hiroyuki
H
Tajima
Tsuyoshi
T
Hirakawa
Masakazu
M
Ishigami
Kousei
K
Ushijima
Yasuhiro
Y
Okamoto
Daisuke
D
Yabuuchi
Hidetake
H
Taketomi
Akinobu
A
Nishihara
Yunosuke
Y
Fujita
Nobuhiro
N
Honda
Hiroshi
H