P128 | Beyond thresholds: hyperviscosity syndrome in Waldenström’s macroglobulinemia - A Case report: B.A.L. Rocca1, S. Tunnera2, B. Matilde2, M.C. Vinci3, M.L. Imbalzano3, V. Vannucchi3, B.M.A. Cimolato3 | 1AUO Careggi, Firenze, 2AUO Careggi, Firenze, 3Santa Maria Nuova, Firenze, Italy. Italian Journal of Medicine, v. 19, n. s1, 27 Aug.2025.