Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2023 Oct;24(5):230-235.
doi: 10.7181/acfs.2023.00199. Epub 2023 Oct 20.

Solitary fibrous tumor in the temporalis muscle: a case report and literature review

Jun Ho Choi  1 , Soo Hyuk Lee  1 , Jae Ha Hwang  1 , Kwang Seog Kim  1 , Sam Yong Lee  1
Affiliations

Solitary fibrous tumor in the temporalis muscle: a case report and literature review

Jun Ho Choi et al. Arch Craniofac Surg. 2023 Oct.

Abstract

Solitary fibrous tumor (SFT) is an infrequently occurring neoplasm most commonly observed in the pleura, but it can develop in the head and neck region in occasional cases. However, no reports have described SFT in the temporalis muscle. Herein, we present the first known case of SFT in the temporalis muscle. A 47-year-old man complained of a painless palpable mass on his right temple. Facial enhanced computed tomography identified a 4.0× 2.9× 1.4 cm mass presenting as a vascular tumor in the right temporalis muscle under the zygomatic arch. The mass was excised from the right temporalis muscle under general anesthesia. A histopathologic examination revealed that the mass was an SFT. No complications occurred after surgery, including functional disability or sensory loss. The patient was followed up for 3 months without complications. Although SFT in extrapulmonary regions is rare, it should be considered in the differential diagnosis of masses that occur in the temporal area.

Keywords: Case reports; STAT6 transcription factor; Solitary fibrous tumors; Temporal muscle.

PubMed Disclaimer

Conflict of interest statement

Conflict of interest

Jun Ho Choi, Jae Ha Hwang, and Kwang Seog Kim serving as editorial board members of the journal were not involved in the following: selection of the peer reviewer, evaluation of the article, and decision process of acceptance of this article. No other potential conflicts of interest relevant to this article were reported.

Figures

Fig. 1.
Fig. 1.
A 47-year-old man with a painless mass in the right temporal area.
Fig. 2.
Fig. 2.
Computed tomography showing a 4.0×2.9×1.4 cm mass in the right temporalis muscle. The well-defined heterogeneously enhancing mass resembles a vascular tumor. Enhancing image in an axial view and coronal view.
Fig. 3.
Fig. 3.
Gross photograph of mass removed from the right temporalis muscle.
Fig. 4.
Fig. 4.
Histopathologic findings. Short spindle cell proliferation with variable cellularity depending on the area. (A) The hypocellular area demonstrating spindle cell proliferation admixed with branching and hyalinized blood vessels (H&E stain, ×100). (B) The hypercellular area containing closely spaced short spindle cells (H&E stain, ×200). (C, D) Immunoreactive for signal transducer and activator of transcript 6 (STAT6) with a nuclear pattern (C: immunohistochemical stain for STAT6, ×200) and immunonegative for CD34 (D: immunohistochemical stain for CD34, ×200).
Fig. 5.
Fig. 5.
Follow-up photograph 3 months after surgery.
See this image and copyright information in PMC

Similar articles

See all similar articles

References

    1. Davanzo B, Emerson RE, Lisy M, Koniaris LG, Kays JK. Solitary fibrous tumor. Transl Gastroenterol Hepatol. 2018;3:94. - PMC - PubMed
    1. Flucke U, Thompson LDR, Wenig BM. Solitary fibrous tumour. In: El-Naggar AK, Chan JKC, Grandis JR, Takata T, Slootweg PJ, editors. WHO classification of head and neck tumours. IARC; 2017. p. 45
    1. Demicco EG, Park MS, Araujo DM, Fox PS, Bassett RL, Pollock RE, et al. Solitary fibrous tumor: a clinicopathological study of 110 cases and proposed risk assessment model. Mod Pathol. 2012;25:1298–306. - PubMed
    1. Yoon CM, Cho JM, Lim KR, Kim SK, Kim SJ, Lee KC. Solitary fibrous tumor in buccal cheek mucosa. Arch Craniofac Surg. 2017;18:218–21. - PMC - PubMed
    1. Baneckova M, Martinek P, Skalova A, Mezencev R, Hadravsky L, Michal M, et al. Solitary fibrous tumors of the head and neck region revisited: a single-institution study of 20 cases and review of the literature. Hum Pathol. 2020;99:1–12. - PubMed