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The patient was initially monitored for long COVID and was referred to the nephrologist after she was found to have further worsening of her renal function. She underwent a renal biopsy and findings on light microscopy, immunofluorescence, and electron microscopy were consistent with crescentic glomerulonephritis, pauci-immune type with chronicity, and acute interstitial nephritis. These findings and a positive anti-neutrophilic cytoplasmic antibody immunofluorescence assay (ANCA IFA) and myeloperoxidase antibody confirmed myeloperoxidase-ANCA-positive pauci-immune glomerulonephritis. The patient was started on treatment with corticosteroids and Rituximab, resulting in improvement in her symptoms and renal function.<\/jats:p>","DOI":"10.1177\/00368504251364950","type":"journal-article","created":{"date-parts":[[2025,8,5]],"date-time":"2025-08-05T05:38:44Z","timestamp":1754372324000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Pauci-immune glomerulonephritis: Post-COVID kidney disease continues to reappear, a case report"],"prefix":"10.1177","volume":"108","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6307-9719","authenticated-orcid":false,"given":"Dory Arevalo","family":"Salazar","sequence":"first","affiliation":[{"name":"Department of Pathology, Banner University Medical Center, Tucson, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-1961-2598","authenticated-orcid":false,"given":"Devendra","family":"Bhandari","sequence":"additional","affiliation":[{"name":"Department of Inpatient Medicine, Banner University Medical Center, Tucson, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nikita","family":"Waiba","sequence":"additional","affiliation":[{"name":"Department of Inpatient Medicine, Banner University Medical Center, Tucson, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shilpa","family":"Pedapati","sequence":"additional","affiliation":[{"name":"Department of Nephrology, Banner University Medical Center, Tucson, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Govinda","family":"Adhikari","sequence":"additional","affiliation":[{"name":"Department of Inpatient Medicine, Banner University Medical Center, Tucson, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2025,8,4]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-023-30077-1"},{"key":"e_1_3_3_3_2","doi-asserted-by":"crossref","unstructured":"Hallek M Adorjan K Behrends U et al. 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