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Here, we report for the first time a case of a 45-year-old female patient with known FOP recovering from COVID-19 with disease progression potentially linked with the viral illness. In December 2020 the patient contracted a mild form of COVID-19 infection without need for hospital admission. Since January 2021, the patient felt unwell, with occasional abdominal pain which progressively intensified. In March 2021 she presented with new onset of HO, complaining of pain, swelling and thickening sensation in the lower abdomen and left part of the neck. Computerized tomography (CT) and cytokine analysis were performed. CT scan revealed new heterotopic bone formation in multiple soft tissue areas of the neck indicating clear radiological progression. Radiotherapy, which has proven to be an efficient tool to control HO in this patient, was not able to halt HO formation after COVID-19 infection. Cytokine analysis of a plasma sample obtained during a flare-up after COVID-19 infection showed a significantly elevated pro-inflammatory cytokines compared to a flare-up panel prior to infection. Of the 23 analyzed levels of cytokines, a staggering number of 21 were above normal levels. This case is the first confirmation of uncontrolled post-COVID-19 effects in a FOP patient, which manifested with flare-ups followed by progressive HO, possibly caused by a thus far, never described form of post-COVID syndrome.<\/jats:p>","DOI":"10.1007\/s00296-021-04911-6","type":"journal-article","created":{"date-parts":[[2021,6,10]],"date-time":"2021-06-10T07:07:21Z","timestamp":1623308841000},"page":"1495-1501","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Post-COVID-19 exacerbation of fibrodysplasia ossificans progressiva with multiple flare-ups and extensive heterotopic ossification in a 45-year-old female patient"],"prefix":"10.1007","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9814-3178","authenticated-orcid":false,"given":"Lovorka","family":"Grgurevic","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5920-4169","authenticated-orcid":false,"given":"Rudjer","family":"Novak","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7623-7114","authenticated-orcid":false,"given":"Stela","family":"Hrkac","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7782-1646","authenticated-orcid":false,"given":"Grgur","family":"Salai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3407-0317","authenticated-orcid":false,"given":"Simeon","family":"Grazio","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,6,10]]},"reference":[{"key":"4911_CR1","doi-asserted-by":"publisher","first-page":"291","DOI":"10.1080\/21678707.2017.1304211","volume":"5","author":"FS Kaplan","year":"2017","unstructured":"Kaplan FS, Pignolo RJ, Al Mukaddam MM, Shore EM (2017) Hard targets for a second skeleton: therapeutic horizons for fibrodysplasia ossificans progressiva (FOP). 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This study was approved by the Hospital Centre Sisters of Charity\u2019s Ethical Committee (251-29-11-20-01-5\/class 003-06\/20-03\/023).","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}}]}}