The absolute volumes of both the left Hb (HCs = 24.02 ± 3.20 mm3; SCH = 21.83 ± 2.16 mm3; P = 0.016) and right Hb (HCs = 20.42 ± 3.46 mm3; SCH = 18.27 ± 2.63 mm3; P = 0.025) were significantly smaller in the SCH patients than in the HCs. Here, GSTM1 is linked to spindle cell hemangioma.