Heralding Extramedullary Blast Crisis: Horner’s Syndrome with Brachial Plexopathy in a Patient with Chronic Myelogenous Leukemia

Figure 4

Histopathological analysis. (a) Low magnification view with effacement of lymph node architecture. (b) High magnification view with numerous immature cells (blasts). (c) A proportion of the immature cells are positive for myeloperoxidase by immunohistochemistry. (d) A proportion of the immature cells are positive for CD117 by immunohistochemistry.

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