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contentuptodate· Content· item f35_54_36710

©2013 UpToDate ® Print Email Alveolar rhabdomyosarcoma The presence of any alveolar pattern is sufficient to categorize a tumor as an alveolar rhabdomyosarcoma. The typical appearance is that of fibrovascular septae that are lined with densely packed ovoid to round tumor cells, and separated by pseudo-alveolar spaces, which vaguely resemble pulmonary alveoli. (H&E, 200x original magnification).