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A 43-year-old male presented with a rapidly enlarging, painless swelling below the right mandibular angle over 2 months. Clinical examination revealed a firm, mobile mass without skin fixation or lymphadenopathy. Ultrasound and magnetic resonance imaging were performed, followed by fine-needle aspiration cytology and excisional biopsy. Ultrasound demonstrated a well-defined, hypoechoic lobulated lesion (23\u2009\u00d7\u200913\u2009\u00d7\u20098\u2009mm) within the superficial masseter, showing mild internal vascularity and no bone involvement. Magnetic resonance imaging revealed an iso- to slightly hypointense T1 signal, hyperintense T2\/ short tau inversion recovery signal, and homogeneous postcontrast enhancement with smooth margins, features suggestive of a benign myofibroblastic lesion. Excisional biopsy confirmed the diagnosis of nodular fasciitis. This case indicates that masseteric nodular fasciitis, a rare benign lesion, may present with imaging features of small size, smooth margins, homogeneous enhancement, and mild vascularity in the context of trauma history. Recognition of this self-limited myofibroblastic proliferation can prevent unnecessary radical surgery and guide conservative management.<\/jats:p>","DOI":"10.1177\/03000605261436584","type":"journal-article","created":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T05:16:58Z","timestamp":1777439818000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Nodular fasciitis of the masseter muscle: Radiologic and pathologic correlation of a rare benign lesion"],"prefix":"10.1177","volume":"54","author":[{"given":"Saeid Sadeghi","family":"Joni","sequence":"first","affiliation":[{"name":"Razi Hospital, Guilan University of Medical Sciences"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3543-9975","authenticated-orcid":false,"given":"Mahsa","family":"Motiei","sequence":"additional","affiliation":[{"name":"Razi Hospital, Guilan University of Medical Sciences"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maryam","family":"Akbari","sequence":"additional","affiliation":[{"name":"Otorhinolaryngology Research Center, School of Medicine, Guilan University of Medical Sciences, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2026,4,28]]},"reference":[{"key":"e_1_3_9_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijscr.2018.01.016"},{"key":"e_1_3_9_3_2","doi-asserted-by":"publisher","DOI":"10.3941\/jrcr.v8i5.1903"},{"key":"e_1_3_9_4_2","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(19820415)49:8<1668::AID-CNCR2820490823>3.0.CO;2-9"},{"key":"e_1_3_9_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-010-1392-7"},{"key":"e_1_3_9_6_2","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.N.00649"},{"key":"e_1_3_9_7_2","doi-asserted-by":"publisher","DOI":"10.3892\/ol.2021.12542"},{"key":"e_1_3_9_8_2","first-page":"e37047","article-title":"MRI evaluation of soft tissue tumors and tumor-like lesions of extremities","volume":"15","author":"Goyal S","year":"2023","unstructured":"Goyal S, Rangankar V, Deshmukh S, et\u00a0al. 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