Adipocyte-Like Differentiation in a Posttreatment Embryonal Rhabdomyosarcoma

Figure 1

Gross and microscopic findings. (a) Hematoxylin and eosin (H&E) stain from fine-needle aspiration sample, prior to chemotherapy treatment, reveals a heterogeneous population of ovoid to slightly spindled cells (H&E, ×100 original magnification), (b) a subset of tumor cells are positive for desmin immunostain (×400 original magnification), and (c) most tumor cells are positive for myogenin (myogenin immunostain, ×400 original magnification). (d) Gross appearance of resected tumor after adjuvant chemotherapy treatment.

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