{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T11:00:15Z","timestamp":1781002815514,"version":"3.54.1"},"reference-count":10,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T00:00:00Z","timestamp":1780963200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Diagnostics"],"abstract":"<jats:p>Hidrocystoma is a rare benign cystic tumor of sweat gland origin, most commonly located in the periorbital region, with uncommon occurrence in the retroauricular area. This article presents a case of a 14-year-old patient with a retroauricular mass present for approximately four years, which had remained stable in size until a gradual enlargement was observed over the preceding 11 months. The lesion was associated with intermittent fluid discharge and periodic episodes of local skin inflammation, likely related to mechanical irritation from earrings worn by the patient. Otherwise, the lesion was asymptomatic, with no persistent pain or systemic signs of infection. Clinical examination revealed a well-circumscribed, cystic lesion located in the retroauricular region. Ultrasonographic evaluation demonstrated features consistent with a benign cystic structure. Based on clinical and imaging findings, the lesion was qualified for surgical excision. Complete removal of the mass was performed without complications. Histopathological examination confirmed the diagnosis of hidrocystoma. The postoperative course was uneventful, with no recurrence observed during follow-up. This case highlights a rare location and atypical clinical course of hidrocystoma in an adolescent patient, emphasizing the role of clinical assessment and ultrasonography in preoperative evaluation, as well as the potential impact of chronic mechanical irritation on local inflammatory episodes. Surgical excision remains an effective definitive treatment.<\/jats:p>","DOI":"10.3390\/diagnostics16121772","type":"journal-article","created":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T09:46:54Z","timestamp":1780998414000},"page":"1772","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Uncommon Presentation of Hidrocystoma in a 14-Year-Old Girl"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5030-9546","authenticated-orcid":false,"given":"Agata Maria","family":"Kawalec-Rutkowska","sequence":"first","affiliation":[{"name":"Department of Anatomy, Institute of Medical Sciences, University of Opole, Oleska St. 48, 45-052 Opole, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Erasti, M., D\u2019Onghia, M., Batsikosta, A., Suppa, M., Tognetti, L., Cappilli, S., Peris, K., La Marca, F., Perrot, J.L., and Rubegni, G. (2024). Dermoscopy, Line-Field Confocal Optical Coherence Tomography, Reflectance Confocal Microscopy, and Ultra-High-Frequency Ultrasound: Clues for the Diagnosis of Hidrocystomas. Diagnostics, 14.","DOI":"10.3390\/diagnostics14232671"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"872","DOI":"10.25259\/IJDVL_340_2021","article-title":"Usefulness of ultrasound in diagnosis of plantar epidermal cyst","volume":"87","author":"Park","year":"2021","journal-title":"Indian J. Dermatol. Venereol. Leprol."},{"key":"ref_3","first-page":"403","article-title":"Apocrine Hidrocystoma Mimicking Breast Lesion in a Child from Tunisia","volume":"49","author":"Zouari","year":"2020","journal-title":"Iran. J. Public Health"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"e444","DOI":"10.1097\/SCS.0000000000007257","article-title":"Intraconal Orbital Hidrocystoma in an Infant","volume":"32","author":"Bagheri","year":"2021","journal-title":"J. Craniofac. Surg."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"69","DOI":"10.5021\/ad.2010.22.1.69","article-title":"Eccrine hidrocystoma in a child: An atypical presentation","volume":"22","author":"Nam","year":"2010","journal-title":"Ann. Dermatol."},{"key":"ref_6","first-page":"5902547","article-title":"Blue Ear Cyst: A Rare Eccrine Hidrocystoma of the Ear Canal and Successful Endoscopic Excision","volume":"2016","author":"Mur","year":"2016","journal-title":"Case Rep. Otolaryngol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"e1181","DOI":"10.1097\/MAO.0000000000003220","article-title":"Apocrine Hidrocystoma of the External Auditory Canal in a Child","volume":"42","author":"Tachibana","year":"2021","journal-title":"Otol. Neurotol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"e231","DOI":"10.1111\/pde.13485","article-title":"Apocrine hidrocystoma on the genitalia of a 9-year-old girl","volume":"35","author":"Matsuyama","year":"2018","journal-title":"Pediatr. Dermatol."},{"key":"ref_9","first-page":"72","article-title":"Retroauricular apocrine hidrocystoma: A very rare case report","volume":"10","author":"Ghavami","year":"2025","journal-title":"Acta Oto-Laryngol. Case Rep."},{"key":"ref_10","first-page":"34","article-title":"A rare pathology of postauricular region: Apocrine hidrocystoma","volume":"2","author":"Akidil","year":"2014","journal-title":"Int. J. Clin. Dermatol. Res."}],"container-title":["Diagnostics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2075-4418\/16\/12\/1772\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T10:36:22Z","timestamp":1781001382000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2075-4418\/16\/12\/1772"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,6,9]]},"references-count":10,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2026,6]]}},"alternative-id":["diagnostics16121772"],"URL":"https:\/\/doi.org\/10.3390\/diagnostics16121772","relation":{},"ISSN":["2075-4418"],"issn-type":[{"value":"2075-4418","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,6,9]]}}}