Fatty rind of intramuscular soft-tissue tumors of the extremity: is it different from the split fat sign?

Sung, Jin Hyung; Kim, Jee Young

doi:10.1007/s00256-017-2598-5

Cited by 13 publications

(2 citation statements)

References 12 publications

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“…It represents fat deposition seen as a tapered rim of fat signal adjacent to the proximal and distal ends of a lesion. It is due to the remodeling of fat around the neuromuscular bundle as the tumor grows in the intermuscular space [21,27,28].…”

Section: Discussionmentioning

confidence: 99%

A Retrospective Analysis of High Resolution Ultrasound Evaluation of the “Split Fat Sign” in Peripheral Nerve Sheath Tumors

Deka,

Shah,

Jiménez

et al. 2023

Healthcare

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Peripheral nerve sheath tumors (PNST) comprise schwannomas and neurofibromas. The finding of increased adipose tissue around benign PNSTs has been described as the “split fat sign” on magnetic resonance imaging exams, which is suggestive of an intramuscular or intermuscular location of the tumor. However, few studies have described this sign as a salient ultrasound feature of PNSTs. The main purpose of this study was to retrospectively evaluate the presence of increased fatty tissue deposition around benign PNSTs diagnosed by high-resolution ultrasound. In addition, we aimed to corroborate the presence of vascularization around the affected area. A retrospective analysis of ten cases of PNSTs and two cases of post-traumatic neuromas diagnosed by high-resolution ultrasound was performed with a Logiq® P8 ultrasound with a 2–11 MHz multifrequency linear probe L3-12-D (central frequency: 10 MHz). Localized types of neurofibromas and schwannomas in any location were seen as predominantly hypoechoic tumors with an oval or fusiform shape. Exiting and entering nerves (tail sign) were observed in six cases, showing localized lesions both in intermuscular and subcutaneous locations. The presence of increased hyperechoic tissue (the split fat sign) was noted in cases of solitary intermuscular and intramuscular peripheral nerve sheath tumors, mainly the schwannomas. Though small tumors did not demonstrate the tail sign, the increase in adipose tissue and vascularity on US was well demonstrated. In conclusion, the nerve in continuity forms the basis of the ultrasonographic diagnosis of PNSTs. However, high-resolution US can convincingly demonstrate the increased presence of fat in the upper and lower poles as well as circumferentially in intermuscular or intramuscular benign PNSTs.

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Section: Discussionmentioning

confidence: 99%

A Retrospective Analysis of High Resolution Ultrasound Evaluation of the “Split Fat Sign” in Peripheral Nerve Sheath Tumors

Deka,

Shah,

Jiménez

et al. 2023

Healthcare

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“…CT image is nonspecific, showing a well-defined hypodense lesion in the intramuscular space. MRI shows homogeneous (81-100%), hypointense lesions on the T1 sequence and hyperintense lesions on the T2 sequence owing to the liquid contents of the tumor, as well as the perilesional rind of fat or edema 6,7 .…”

Section: Discussionmentioning

confidence: 99%

Intramuscular myxoma of a thigh: A case report

et al. 2021

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Introduction. Myxoid lesions may present as benign, locally invasive, or malignant tumors. The incidence of intramuscular myxoma is nearly 1 case in 1,000,000 inhabitants. Case report. A 73-year-old man presented to our clinic with a painless, subcutaneous tumor of the adductor region of the left thigh. Computed tomography and magnetic resonance imaging showed a cystic tumor with thin septae located in the adductor muscles. The tumor was extirpated in toto, with the histopathological confirmation of an intramuscular myxoma. Conclusion. This example may serve to increase the awareness of a successful intramuscular myxoma treatment among surgeons and radiologists in small countries.

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Calcified leiomyoma of the deltoid: pathophysiology and imaging review

Rowland¹,

Call²,

Mujtaba³

et al. 2018

Skeletal Radiol

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Leiomyomas are benign tumors of smooth muscle cells. Leiomyomas of somatic soft tissue are a specific class of leiomyoma believed to arise from the smooth muscle cells found in the walls of blood vessels and represent less than 4% of benign, somatic soft tissue tumors. Of the somatic soft tissue tumors, approximately one-third will become calcified. We report an intramuscular, calcified leiomyoma arising from the left deltoid of a 47-year-old Caucasian male. To the best of the authors' knowledge, this is the first reported case of a calcified, intramuscular leiomyoma of the deltoid. Imaging studies and patient presentation were initially suggestive of tumoral calcinosis or myositis ossificans. It was not until pathologic examination that the correct diagnosis of the calcified leiomyoma was made. Leiomyoma should be included in the differential diagnosis of calcified soft tissue masses. If excised with adequate margins, recurrence is unlikely.

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Fatty rind of intramuscular soft-tissue tumors of the extremity: is it different from the split fat sign?

Cited by 13 publications

References 12 publications

A Retrospective Analysis of High Resolution Ultrasound Evaluation of the “Split Fat Sign” in Peripheral Nerve Sheath Tumors

A Retrospective Analysis of High Resolution Ultrasound Evaluation of the “Split Fat Sign” in Peripheral Nerve Sheath Tumors

Intramuscular myxoma of a thigh: A case report

Calcified leiomyoma of the deltoid: pathophysiology and imaging review

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