{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T16:58:02Z","timestamp":1761238682854,"version":"3.44.0"},"reference-count":11,"publisher":"BMJ","issue":"11","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2019,10,28]]},"published-print":{"date-parts":[[2019,11]]},"abstract":"<jats:p>Cholesteatoma of the paranasal sinus is a very rare condition. As in the tympanomastoid region where cholesteatomas are a common entity, the paranasal sinus cholesteatomas also tend to erode the surrounding bony structures. Because of the extensive bony erosion, this condition often masquerades as a chronic granulomatous or a malignant lesion. Clinical presentation can be quite varied like facial deformities, visual and neurological deficits. Radiological findings are also non-specific making a preoperative diagnosis challenging. Histopathological examination is the only confirmatory investigation. We present a patient with frontal cholesteatoma who presented with forehead swelling of 1\u2009month duration. Since the diagnosis could be obtained only intraoperatively, the patient required multiple surgeries. Frontal sinus cholesteatomas often require a combined endoscopic and external approach to ensure complete disease clearance. Periodic follow-up is essential to rule out recurrence.<\/jats:p>","DOI":"10.1136\/bcr-2019-231495","type":"journal-article","created":{"date-parts":[[2019,11,20]],"date-time":"2019-11-20T05:09:31Z","timestamp":1574226571000},"page":"e231495","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":5,"title":["Frontal sinus cholesteatoma: a masquerading diagnosis"],"prefix":"10.1136","volume":"12","author":[{"given":"Regi","family":"Kurien","sequence":"first","affiliation":[{"name":"Department of Otorhinolaryngology, Christian Medical College, Vellore, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Leah","family":"Thomas","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology, Christian Medical College, Vellore, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lalee","family":"Varghese","sequence":"additional","affiliation":[{"name":"Department of 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