Ewing's sarcoma metastatic to focal nodular hyperplasia of liver.

A case is presented of a young woman discovered at thoracotomy to have Ewing's sarcoma of the left lower ribs with soft tissue extension to the diaphragm and thoracic wall. Laparotomy at the same operation showed a nodule of focal nodular hyperplasia of the liver with a focus of metastasis from the sarcoma within the area of hyperplasia. This is the first report of metastasis of any tumor to a hepatic lesion of this sort. Possible reasons for metastasis to this type of lesion are discussed.