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While it is generally considered a routine and safe procedure in children, it should be conducted with the primary objective of addressing the following question:\u00a0do the prognosis and treatments vary based on the findings of kidney biopsy? In children presenting with idiopathic nephrotic syndrome (INS), guidelines suggest to consider kidney biopsy for individuals older than 12\u00a0years, primarily due to the possible increased incidence of different glomerulonephritis compared to younger patients, who predominantly manifest with minimal change disease. However, these guidelines also advocate for uniform therapeutic strategies, typically steroids, irrespective of the age or histological findings. Whether the age of more than 12\u00a0years may be a recommendation for performing kidney biopsy at presentation of INS is debatable. Instead, kidney biopsy could be reserved for steroid-resistant cases. On the other hand, when kidney biopsy is performed in INS, particularly in focal segmental glomerulosclerosis, histology may reveal additional lesions, that are strongly associated with a poorer response to treatment and worse clinical outcomes. Therefore, current guidelines on treatments of nephrotic syndrome may appear overly restrictive, despite the relevant findings provided by kidney biopsy. Therefore, in the present manuscript, which is part of a pro\u2013con debate on the management of nephrotic syndrome in adolescents, we emphasize the potential role of performing a kidney biopsy before initiating corticosteroid treatment.<\/jats:p>","DOI":"10.1007\/s00467-024-06510-6","type":"journal-article","created":{"date-parts":[[2024,9,9]],"date-time":"2024-09-09T21:02:25Z","timestamp":1725915745000},"page":"571-578","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["To biopsy or not to biopsy a teenager with idiopathic nephrotic syndrome? Biopsy first"],"prefix":"10.1007","volume":"40","author":[{"given":"Carolina","family":"Bigatti","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Decimo S.","family":"Chiarenza","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6121-5326","authenticated-orcid":false,"given":"Andrea","family":"Angeletti","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,9,9]]},"reference":[{"key":"6510_CR1","doi-asserted-by":"publisher","first-page":"61","DOI":"10.1016\/S0140-6736(18)30536-1","volume":"392","author":"DG Noone","year":"2018","unstructured":"Noone DG, Iijima K, Parekh R (2018) Idiopathic nephrotic syndrome in children. 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