Fat-forming solitary fibrous tumor of the sacrum: A case report and literature review

Toshihiro Furuta, MD, PhD; Yudai Nakai, MD, PhD; Wataru Gonoi, MD, PhD; Ryo Kurokawa, MD, PhD; Naomasa Okimoto, MD; Naoya Sakamoto, MD; Haruyuki Fukuchi, MD; Hiroshi Kobayashi, MD, PhD; Naohiro Makise, MD, PhD; Osamu Abe, MD, PhD

Radiology Case Reports (Jul 2021)

Fat-forming solitary fibrous tumor of the sacrum: A case report and literature review

Toshihiro Furuta, MD, PhD,
Yudai Nakai, MD, PhD,
Wataru Gonoi, MD, PhD,
Ryo Kurokawa, MD, PhD,
Naomasa Okimoto, MD,
Naoya Sakamoto, MD,
Haruyuki Fukuchi, MD,
Hiroshi Kobayashi, MD, PhD,
Naohiro Makise, MD, PhD,
Osamu Abe, MD, PhD

Affiliations

Toshihiro Furuta, MD, PhD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan; Corresponding author.
Yudai Nakai, MD, PhD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Wataru Gonoi, MD, PhD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Ryo Kurokawa, MD, PhD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Naomasa Okimoto, MD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Naoya Sakamoto, MD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Haruyuki Fukuchi, MD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Hiroshi Kobayashi, MD, PhD: Department of Orthopaedic Surgery, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Naohiro Makise, MD, PhD: Department of Pathology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Osamu Abe, MD, PhD: Department of Radiology, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan

Journal volume & issue: Vol. 16, no. 7
pp. 1874 – 1877

Abstract

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Fat-forming variant of solitary fibrous tumor (SFT) is a rare mesenchymal neoplasm. Here we report the case of a 33-year-old woman who developed pain and muscle weakness from the posterior aspect of the right hip to lower extremity. Imaging examinations revealed a mass with fatty components and hypervascular solid components filling the sacral spinal canal and sacral foramen. The sacral mass was resected and histological examination of the specimens revealed patternless proliferation of short spindle-shaped cells with staghorn blood vessels. A number of mature adipocyte-like cells were also observed. The tumor cells were positive for STAT6 and the nuclei of the adipocytes were also positive, which was diagnostic for fat-forming SFT.

Published in Radiology Case Reports

ISSN: 1930-0433 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Medicine: Medicine (General): Medical physics. Medical radiology. Nuclear medicine
Website: https://www.sciencedirect.com/journal/radiology-case-reports

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