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In the present study we aimed to assess the relationships between Stensen\u2019s duct and masseter muscle and their implications in the aetiopathogenesis of recurrent parotitis secondary to masseter muscle dysfunction. Forty-one patients with recurrent unilateral parotitis and nine with bilateral recurrent parotitis, all with a clinical suspicious of masseter muscle hypertrophy due to bruxism were enrolled. They underwent ultrasonography as a first line examination and then MR sialography and sialendoscopy. Different anatomical features were studied. Involved parotid glands had a wider duct compared to contralateral unaffected parotid glands of patients with recurrent parotitis (<jats:italic>p<\/jats:italic>\u2009=\u20090.00134); male subjects with parotitis had a longer duct compared to the salivary glands of healthy patients (<jats:italic>p<\/jats:italic>\u2009=\u20090.00943 for affected glands and <jats:italic>p<\/jats:italic>\u2009=\u20090.00629 for the contralateral). A concordance between the evidence of an acute duct angle during sialendoscopy and a wider duct in patients with parotitis was observed although not statistically significant. These initial findings suggest that the masticatory muscle dysfunction related to bruxism seems to condition alteration of parotid duct course and anatomy thus favouring the occurrence of recurrent parotitis. A specific diagnostic iter based on clinical evaluation, dynamic ultrasonography and MR sialography, is therefore, mandatory to confirm the relationship between masseter muscle anatomy and parotid duct anomalies; this is the premise for an adequate therapeutic approach to underlying masticatory muscle disorder.<\/jats:p>","DOI":"10.1007\/s11547-024-01802-1","type":"journal-article","created":{"date-parts":[[2024,3,21]],"date-time":"2024-03-21T12:02:07Z","timestamp":1711022527000},"page":"785-793","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["MR sialographic assessment of the masseter muscle and the ductal kinking in patients with recurrent parotitis"],"prefix":"10.1007","volume":"129","author":[{"given":"Pasquale","family":"Capaccio","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7380-565X","authenticated-orcid":false,"given":"Matteo","family":"Lazzeroni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Francesco","family":"Lo Russo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sara","family":"Torretta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniele","family":"Di Pasquale","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Giorgio","family":"Conte","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria Cristina","family":"Firetto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabriele","family":"Nicolino","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michele","family":"Gaffuri","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gianpaolo","family":"Carrafiello","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,3,21]]},"reference":[{"issue":"9","key":"1802_CR1","doi-asserted-by":"publisher","first-page":"1150","DOI":"10.1016\/j.joms.2004.05.116","volume":"62","author":"O Nahlieli","year":"2004","unstructured":"Nahlieli O, Bar T, Shacham R, Eliav E, Hecht-Nakar L (2004) Management of chronic recurrent parotitis: current therapy. 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