Fig. 1From: Pancytopenia in a patient with cystinosis secondary to myelosuppression from cystine crystal deposition: a case reportBone marrow core and aspirate smear. Numerous rhomboid and rectangular shaped, birefringent cystine crystals are visualized under polarized light. a Sheets of histiocytes with refractile cystine crystals seen in the core biopsy (hematoxylin and eosin stain, ×400). b A single histiocyte contains multiple refractile rhomboid/rectangular crystals in the cytoplasm (Giemsa stain, ×1000)Back to article page