Discrimination of well-differentiated liposarcoma from benign lipoma on sonography: an uncontrolled retrospective study
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ORIGINAL ARTICLE–ORTHOPEDICS
Discrimination of well‑differentiated liposarcoma from benign lipoma on sonography: an uncontrolled retrospective study Naoko Shimamori1 · Tomonori Kishino1,2,3 · Naota Okabe4 · Takeshi Morii5 · Satsuki Matsushima2 · Satoko Yamasaki1,2 · Kouki Ohtsuka1,2 · Junji Shibahara4 · Hiroaki Ohnishi1,2 · Takashi Watanabe1,2 Received: 11 May 2020 / Accepted: 24 August 2020 © The Japan Society of Ultrasonics in Medicine 2020
Abstract Purpose Well-differentiated liposarcoma, the most common subtype of liposarcoma, should be discriminated from benign lipoma. However, features on sonography for discriminating these two types of tumor have not been fully investigated. The present study was therefore aimed at clarifying differences in sonographic findings between well-differentiated liposarcoma and lipoma. Methods The study population comprised 23 cases of well-differentiated liposarcoma and 181 cases of lipoma. We investigated differences in sonographic appearance and pathological findings between the two types of tumor. Results Well-differentiated liposarcoma tended to develop more frequently in older patients and in the lower extremities including the gluteal region, compared with lipoma. Concerning sonographic findings, both tumors exhibited well-defined margins and heterogeneous internal echogenicity, including typical tiny striated hyperechoic lines. Well-differentiated liposarcoma was characterized by a higher frequency of the following findings compared with lipoma: (1) deep location, (2) irregular shape, (3) large diameter, (4) hyperechogenicity compared to surrounding tissue, and (5) presence of vascularity on Doppler sonography (p 2.58, and > 3.29 were considered to correspond to statistically significant values of p
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