{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T16:11:21Z","timestamp":1753891881577,"version":"3.41.2"},"reference-count":18,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,2,28]],"date-time":"2025-02-28T00:00:00Z","timestamp":1740700800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Oncol."],"abstract":"<jats:p>Hamartomas are classified as either epithelial, mesenchymal, or epithelium-mesenchymal mixed types. They occur extremely rarely in the nasopharynx. A 58-year-old man had multiple tumors with repeating contraction and relaxation in the nasopharynx shown on endoscopy. One of the tumors was endoscopically resected under general anesthesia for histological examination and was finally diagnosed as mesenchymal hamartoma. Smooth muscle tissue is sometimes confirmed in mesenchymal hamartomas, but spontaneous contraction in nasopharyngeal hamartomas is rare. In this case, coexistence of muscle tissue, Cajal interstitial cell-like cells, and ganglion cells was thought to be a mechanism of spontaneous motility of the tumors. Aberrant or residual foregut tissue in the nasopharynx due to embryological factors may be a contributing factor to the multiple occurrences.<\/jats:p>","DOI":"10.3389\/fonc.2025.1480087","type":"journal-article","created":{"date-parts":[[2025,2,28]],"date-time":"2025-02-28T07:25:16Z","timestamp":1740727516000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Case Report: Multiple mesenchymal hamartomas showing spontaneous motility in the nasopharynx"],"prefix":"10.3389","volume":"15","author":[{"given":"Tetsuya","family":"Kinoshita","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masamitsu","family":"Kono","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryuta","family":"Iwamoto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masayoshi","family":"Hijiya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saori","family":"Takeda","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Makiko","family":"Ohtani","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mikako","family":"Doyama","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daichi","family":"Murakami","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shunji","family":"Tamagawa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shin-Ichi","family":"Murata","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Muneki","family":"Hotomi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2025,2,28]]},"reference":[{"key":"B1","article-title":"Ueber hamartome","volume":"7","author":"Albrecht","year":"1904","journal-title":"Verh Dtsch Pathol Ges"},{"key":"B2","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.3.5665.281","article-title":"Respiratory distress due to nasopharyngeal hamartoma","volume":"3","author":"Birt","year":"1969","journal-title":"Br Med J"},{"key":"B3","article-title":"Cystic hamartoma of the nasopharynx","volume":"84","author":"Brandenburg","year":"1977","journal-title":"Am Acad Opthalmol Otolaryngol"},{"key":"B4","doi-asserted-by":"publisher","DOI":"10.1016\/j.anl.2007.08.010","article-title":"Mesenchymal hamartoma in nasopharynx: a case report","volume":"35","author":"Park","year":"2008","journal-title":"Auris Nasus Larynx"},{"key":"B5","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.3.5613.267","article-title":"Some unusual developmental heterotopias","volume":"3","author":"Willis","year":"1968","journal-title":"Br Med J"},{"key":"B6","doi-asserted-by":"publisher","DOI":"10.1017\/S0022215100084267","article-title":"Hamartoma of nasophaynx","volume":"91","author":"Majumder","year":"1977","journal-title":"Laryngol Otol"},{"key":"B7","doi-asserted-by":"publisher","DOI":"10.5606\/kbbihtisas.2013.06977","article-title":"Respiratory epithelial adenomatoid hamartoma: a rare nasopharyngeal mass lesion","volume":"23","author":"Ko\u00e7","year":"2013","journal-title":"Kulak Burun Bogaz Ihtis Derg"},{"key":"B8","doi-asserted-by":"publisher","DOI":"10.1002\/hed.2880140413","article-title":"Hamartomas of the nose and nasopharynx","volume":"14","author":"Graeme-Cook","year":"1992","journal-title":"Head Neck"},{"key":"B9","doi-asserted-by":"publisher","DOI":"10.1016\/0030-4220(74)90397-1","article-title":"Glandular (seromucinous) hamartoma of the nasopharynx","volume":"38","author":"Baillie","year":"1974","journal-title":"Oral Surg"},{"key":"B10","doi-asserted-by":"publisher","DOI":"10.1016\/j.pathol.2016.03.009","article-title":"A case report of spontaneous contraction within a nasopharyngeal mesenchymal hamartoma","volume":"48","author":"Cox","year":"2016","journal-title":"Pathology"},{"key":"B11","doi-asserted-by":"publisher","DOI":"10.1002\/lary.1983.93.issue-4","article-title":"Nasopharyngeal hamartoma; 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