{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T02:39:37Z","timestamp":1781663977633,"version":"3.54.5"},"reference-count":25,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[2023,4,21]],"date-time":"2023-04-21T00:00:00Z","timestamp":1682035200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Pediatr Dev Pathol"],"published-print":{"date-parts":[[2023,7]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Focal nodular hyperplasia (FNH) is a benign liver lesion classically presenting in young females. In children, FNH is rare and its detailed clinicopathologic characteristics remain largely unknown. Furthermore, there are no studies comparing pediatric FNH features to those presenting in adults.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>In this study, we analyzed a total of 47 FNH cases in pediatric patients (age range: 23\u2009days to 18\u2009years) from 3 centers and compared them to a cohort of 31 FNH cases in adult patients (age range: 20\u201364\u2009years).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>Of the pediatric cases, 13 cases (28%) had a history of a prior malignancy of which 4 were treated with chemoradiation and stem cell transplantation (SCT), 5 with chemoradiation alone and 3 with chemotherapy and SCT. In the pediatric cases 41 (87%) had a central scar and 46 (98%) had fibrous septa. Both pediatric and adult FNH were more common in female patients. Cases in pediatric patients were also significantly associated with larger size ( P\u2009=\u2009.047), absence of dystrophic vessels ( P\u2009=\u2009.001), absence of sinusoidal dilatation ( P\u2009=\u2009.029), pseudoacini formation ( P\u2009=\u2009.013), and steatosis ( P\u2009=\u2009.029).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>In our experience although most cases of pediatric FNH show the classic histologic features seen in adults, some significant differences exist, and awareness of these findings could aid in the evaluation of these rare cases.<\/jats:p>\n                  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