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Figure 1: (a) Marrow aspirate showing increased atypical and immature mast cells (MCs) (H and E, ×100); (b) Bone biopsy showing immature MC infiltrate (H and E, ×60) and (c) Bone biopsy showing strong (bright) CD117 + MC infiltrate (×60)

Figure 1: (a) Marrow aspirate showing increased atypical and immature mast cells (MCs) (H and E, ×100); (b) Bone biopsy showing immature MC infiltrate (H and E, ×60) and (c) Bone biopsy showing strong (bright) CD117 + MC infiltrate (×60)