PO:29:144 | Refractory localized pain in fibromyalgia and the importance of differential diagnosis: two cases of Bertolotti’s syndrome and avascular necrosis successfully treated with targeted therapy: Andrea Lacarpia1, Riccardo Terribili1, Silvia Valentini1, Marta Fabbroni1, Stefano Barbagli1, Stefano Gentileschi1, Caterina Baldi1, Luca Cantarini1, Bruno Frediani1 | 1Azienda Ospedaliera Universitaria Senese, Università degli Studi di Siena, Italy. Reumatismo [Internet]. 2025 Nov. 25 [cited 2026 Jun. 28];77(s1). Available from: https://www.reumatismo.org/reuma/article/view/2202