Ulcerating necrobiotic xanthogranuloma: A clinical sign to reconsider progression from MGUS to multiple myeloma - Christopher J. Fay, BA; Christopher Iriarte, MD; Dorsa Moslehi, BA; Jimmy Lam, MD; Igor Katsyv, MD, PhD; Nicole R. LeBoeuf, MD, MPH (Elsevier, 2023)