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      Comprehensive Review of Reported Nonclassical Spindle Cell Lipoma Presentations and a Unique Case Report

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          Abstract

          Introduction:

          Spindle cell lipoma (SCL) is a rare subset of benign lipomatous neoplasms, making up approximately 1.5% of all adipocytic neoplasms. Since SCLs were first described in 1975, numerous nonclassical cases have been reported in the literature, with variation in location, cytologic composition, patient demographic, and progression. Although some previous reports review related cases of specific rare presentations or institution-based summaries, no comprehensive summary of published nonclassical SCL case reports has been done.

          Methods:

          PubMed was queried for nonclassical presentations of SCL from 1978 to 2018. The nonclassical characteristics were analyzed and described. Those with multiple nonclassical features were studied for common characteristics. The Fisher exact test was used, and a P value of 0.05 was determined to be statistically significant.

          Results:

          We present the first case of a patient with six nonclassical findings: a fast-growing, infiltrating into skeletal muscle, located in two positions on the chin of an 18-year-old African American woman. In this review of the existing nonclassical SCL, we evaluate 125 cases for demographics, location, size, erosion/infiltration, multiple lesions in one individual, and the number of nonclassical findings in one individual. Women and younger than 40-year-old patients significantly present with more than one nonclassical finding.

          Conclusions:

          Thorough characterization of the rare nonclassical cases of this benign condition could guide diagnostic decision-making and identify trends in disease presentation over time as well as alert the clinician to the increased risk of rapid regrowth or invasion in an individual with nonclassical findings especially young age and female gender.

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          Most cited references16

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          Spindle cell lipoma: a clinicopathological study with some original observations.

          Forty-one cases of spindle cell lipoma, an entity first described in 1975, are presented. Of these, 38 were identified in a systematic review of 2478 tumours of adipose tissue diagnosed and treated in one hospital over a 25 year period. This lesion, therefore, accounts for about 1.5% of adipocytic neoplasms and is outnumbered by conventional benign lipomas by approximately 60 to 1. The remaining three were referred cases. Seventy-five per cent of the lesions arose, as expected, on the back of the neck, upper back or shoulder, almost exclusively in males between 40 and 70 years of age. Ten lesions were identified at unusual sites: six in the limbs, three on the face and one on the trunk. One lesion arose within skeletal muscle, a previously unreported phenomenon, and this case showed both cartilaginous and osseous metaplasia. Only one of the 41 tumours has recurred locally. The range of histological features in spindle cell lipoma is described and the differential diagnosis is discussed.
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            Spindle cell lipoma.

            Spindle cell lipoma is a specific type of lipoma that is easily mistaken for a liposarcoma. An analysis of 114 cases of this tumor from the files of the Armed Forces Institute of Pathology reveals that is occurs chiefly in male patients between 45 and 70 years of age and affects the regions of the shoulder and posterior neck almost exclusively. Microscopically, it consists of an intricate mixture of lipocytes and uniform spindle cells within a matrix of mucinous material traversed by a varying number of birefringent collagen fibers. Ultrastructural studies in one case support the fibroblastic nature of the spindle cells. Followup information obtained in 63 patients with this lesion revealed a uniformly favorable clinical course, indicating that local excision is the treatment of choice, and that there is no need or reason for radical surgical procedures.
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              Oral spindle cell lipoma.

              Lipoma is an uncommon benign, oral, soft-tissue neoplasm commonly found on the buccal mucosa. It is predominantly composed of mature fat with or without other mesenchymal tissue elements, showing a variety of histologic subtypes, one of which is the rare "spindle cell variant" with only nine previously reported cases in the English literature. In this report, we review clinical and histomorphologic data of 164 cases of oral lipomas retrieved from the files of Long Island Jewish Medical Center, Department of Dental Medicine (New Hyde Park, NY). Of these, only two cases were diagnosed as the spindle cell variant, further confirming the rarity of this histologic subtype. A review of oral lipoma with particular reference to the spindle cell variant is also presented.
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                Author and article information

                Journal
                Plast Reconstr Surg Glob Open
                Plast Reconstr Surg Glob Open
                GOX
                Plastic and Reconstructive Surgery Global Open
                Lippincott Williams & Wilkins (Hagerstown, MD )
                2169-7574
                18 August 2022
                August 2022
                : 10
                : 8
                : e4462
                Affiliations
                From the [* ]Department of Surgery, Michigan State University, Lansing, Mich.
                []Michigan State University, Lansing, Mich.
                Author notes
                Abigail J. Engwall-Gill, MD, Department of Surgery, Sparrow Hospital, 1215 East Michigan ave, Lansing, MI 48912, E-mail: engwalla@ 123456msu.edu
                Article
                00010
                10.1097/GOX.0000000000004462
                9390821
                35999878
                a0bfdf85-fe55-42ae-a86b-a7f7f23ef74d
                Copyright © 2022 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of The American Society of Plastic Surgeons.

                This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

                History
                : 4 February 2022
                : 24 May 2022
                Categories
                Reconstructive
                Original Article
                Custom metadata
                TRUE
                UNITED STATES
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