{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T04:52:07Z","timestamp":1791348727798,"version":"4.3.1"},"reference-count":10,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T00:00:00Z","timestamp":1791331200000},"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:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Sonidegib, a Hedgehog pathway inhibitor, can induce clinical and imaging remission in locally advanced basal cell carcinoma (BCC). Residual deep tumor may persist after malignant dermoscopic and ultrasound features disappear. This case series assessed the utility and limitations of 20\u201330 MHz high-frequency ultrasound (HFUS) for confirming complete imaging remission after sonidegib.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Cases Presentation<\/jats:title>\n                    <jats:p>Three patients with nodular BCC received sonidegib 200 mg daily (October 2024\u2013May 2026). Two achieved complete imaging remission, defined as resolution of malignant imaging features with residual non-malignant hypoechoic areas allowed, and underwent surgical resection with histopathological correlation; the third declined surgery. Baseline ultrasound was unavailable, so findings were compared with the earliest 3-4-month follow-up.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Response involved lesion shrinkage and loss of intratumoral blood flow. Serial imaging showed gradual resolution of hypoechoic nodules with vascularity on HFUS and blue-gray nests with arborizing vessels on dermoscopy, leaving avascular scar-like structures. Preoperative HFUS residual hypoechoic areas were correlated with histopathology, which showed chronic inflammatory infiltration (case 1) and mild dermal fibrosis (case 2), with no residual tumor. The third patient\u2019s malignant features regressed after six months.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>In this small case series, HFUS monitored deeper tissue changes after targeted therapy. In two histopathologically confirmed patients, complete imaging remission on HFUS plus dermoscopy corresponded to pathological complete response; however, given the small sample and histopathological confirmation in only two patients, this is a possible correspondence rather than evidence of true predictive capability. Post-treatment hypoechoic areas may reflect inflammation, fibrosis, or residual tumor, limiting specificity. Imaging-based complete response should be confirmed by biopsy or excision when feasible. Surgery remains the gold standard; non-surgical patients require close follow-up.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fonc.2026.1945673","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T04:47:02Z","timestamp":1791348422000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Case report: Clinical utility and limitations of high-frequency ultrasound for monitoring sonidegib response in nodular basal cell carcinoma: a three-case series"],"prefix":"10.3389","volume":"16","author":[{"given":"Dandan","family":"He","sequence":"first","affiliation":[{"name":"Department of Ultrasound, Hangzhou Third People\u2019s Hospital, Hangzhou Third Hospital Affiliated to Zhejiang Chinese Medical University","place":["Hangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hailiang","family":"Tao","sequence":"additional","affiliation":[{"name":"Department of Ultrasound, Hangzhou Third People\u2019s Hospital, Hangzhou Third Hospital Affiliated to Zhejiang Chinese Medical University","place":["Hangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ke","family":"Bian","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Hangzhou Third People\u2019s Hospital, Hangzhou Third Hospital Affiliated to Zhejiang Chinese Medical University","place":["Hangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junzhu","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Hangzhou Third People\u2019s Hospital, Hangzhou Third Hospital Affiliated to Zhejiang Chinese Medical University","place":["Hangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Hangzhou Third People\u2019s Hospital, Hangzhou Third Hospital Affiliated to Zhejiang Chinese Medical University","place":["Hangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"13","DOI":"10.1016\/j.det.2022.07.005","article-title":"Basal cell carcinoma","volume":"41","author":"Heath","year":"2023","journal-title":"Dermatologic Clinics"},{"key":"B2","doi-asserted-by":"publisher","DOI":"10.3390\/cancers17061025","article-title":"Dermoscopy of basal cell carcinoma part 3: Differential diagnosis, treatment monitoring and novel 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Dermatovenereology"},{"key":"B9","doi-asserted-by":"publisher","DOI":"10.2147\/CCID.S580359","article-title":"Ultra-high-frequency ultrasound of melanoma excision scars for detection of clinically occult local recurrence: A single-center retrospective study","volume":"19","author":"Russo","year":"2026","journal-title":"Clinical Cosmetic Investigational Dermatol"},{"key":"B10","doi-asserted-by":"publisher","first-page":"45","DOI":"10.1007\/s40477-019-00376-3","article-title":"Utility of a gel stand-off pad in the detection of Doppler signal on focal nodular lesions of the skin","volume":"23","author":"Corvino","year":"2020","journal-title":"J Ultrasound"}],"container-title":["Frontiers in 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