Conversion of multiple solid testicular teratoma metastases to fatty and cystic liver masses following chemotherapy: CT evidence of "maturation"

Testicular germ cell tumour metastases may undergo "retroconversion" to mat ure differentiated teratoma following chemotherapy or irradiation. We repor t a patient with testicular germ cell liver metastases in whom computed tom ography (CT) scans following chemotherapy demonstrated a reduction in CT at tenuation of the liver lesions to that of cystic and fatty density. This is believed to represent CT evidence of liver metastasis "retroconversion", w hich offers the potential for non-invasive monitoring of histological progr ession.