Alveolar RMS. a Loosely cohesive cluster with perivascular arrangement of tumor cells (H&E stain). b Loosely and dispersed, single, small-, and medium-sized cells with hyperchromatic nuclei and prominent nucleoli (H&E stain). c Loosely sheets of medium-sized cells with irregular hyperchromatic nuclei and occasional tumor giant cells (H&E stain). d Rhabdomyoblastic morphology of tumor cells (H&E stain).