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Today, the PARACELSUS score is a validated tool for diagnostics. Based on this score, patients with clearly diagnosed PG were examined with regard to predilection sites. In this retrospective study, the data of patients from the University Hospitals of Essen and Erlangen were analysed in whom the diagnosis of PG could be clearly confirmed using the PARACELSUS score. A total of 170 patients, 49 men (29%) and 121 women (71%) with an average age at first manifestation of 55.5\u2009years, could be included in the analysis. The predilection sites were identified as the lower legs in 80.6% of the patients and the extensor sides in 75.2%. Other localisations of PG were the thighs in 14.1%, mammae and abdomen in 10.0% each, back and gluteal in 7.1% each, feet in 5.9%, arms in 4.7%, genital in 3.5% and head in 2.9%. This retrospective study is the first to identify a collective of PG patients with the highest data quality using the PARACELSUS score. It could be shown that PG can basically occur on the entire integument. However, the predilection sites of PG, which have now been reliably identified for the first time, are the lower legs and in particular the extensor sides.<\/jats:p>","DOI":"10.1111\/iwj.14323","type":"journal-article","created":{"date-parts":[[2023,8,2]],"date-time":"2023-08-02T03:36:09Z","timestamp":1690947369000},"page":"4227-4234","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Predilection sites of pyoderma gangrenosum: Retrospective study of 170 clearly diagnosed patients"],"prefix":"10.1111","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5517-8696","authenticated-orcid":false,"given":"Maurice","family":"Moelleken","sequence":"first","affiliation":[{"name":"Department of Dermatology, Venerology and Allergology University Hospital of Essen  Essen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3722-6383","authenticated-orcid":false,"given":"Cornelia","family":"Erfurt\u2010Berge","sequence":"additional","affiliation":[{"name":"Department of Dermatology University Hospital Erlangen, Friedrich\u2010Alexander University Erlangen\u2010N\u00fcrnberg  Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8828-0980","authenticated-orcid":false,"given":"Moritz","family":"Ronicke","sequence":"additional","affiliation":[{"name":"Department of Dermatology University Hospital Erlangen, Friedrich\u2010Alexander University Erlangen\u2010N\u00fcrnberg  Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dorothee","family":"Busch","sequence":"additional","affiliation":[{"name":"Department of Dermatology University Hospital Erlangen, Friedrich\u2010Alexander University Erlangen\u2010N\u00fcrnberg  Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ursula Hertha","family":"H\u00fcbner","sequence":"additional","affiliation":[{"name":"Health Informatics Research Group Osnabr\u00fcck University of AS  Osnabr\u00fcck Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jens","family":"H\u00fcsers","sequence":"additional","affiliation":[{"name":"Health Informatics Research Group Osnabr\u00fcck University of AS  Osnabr\u00fcck Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mareike","family":"Przysucha","sequence":"additional","affiliation":[{"name":"Health Informatics Research Group Osnabr\u00fcck University of AS  Osnabr\u00fcck Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3893-328X","authenticated-orcid":false,"given":"Joachim","family":"Dissemond","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Venerology and Allergology University Hospital of Essen  Essen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,8]]},"reference":[{"key":"e_1_2_9_2_1","unstructured":"AWMF S1\u2010guideline Pyoderma gangraenosum. 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