SLC29A3 and sinus histiocytosis with massive lymphadenopathy: In 2010, three mutations in SLC29A3 (300 + 1 G > A, 307delT, 1309 G > A) were reported for FHC, SHML/FHC, and RDD syndromes, which exhibit stunted growth, lymphadenopathy, and histiocytosis7.