History of head and neck cancer status post chemotherapy and radiation. Indeterminate lesion in the right hepatic lobe. Please further characterize. ABDOMEN:LIVER, BILIARY TRACT: The liver is normal in morphology. The background parenchyma has normal signal characteristics.There are innumerable T2 bright nonenhancing foci throughout the liver measuring up to 10 mm in diameter likely benign cysts.In the subcapsular right lobe liver there is a focal area of decreased T2 signal. There is ill-defined peripheral enhancement on the postcontrast images. The total area of enhancement measures 4.7 x 2.5 cm. Appearance is most compatible with a metastasis. There is adjacent signal abnormality compatible with macroscopic fat deposition which may relate to chronic perilesional inflammation.No intrahepatic or extrahepatic biliary ductal dilatation.SPLEEN: No significant abnormality noted.PANCREAS: No significant abnormality noted.ADRENAL GLANDS: No significant abnormality noted.KIDNEYS, URETERS: Horseshoe kidney. Multiple bilateral peripelvic cysts. No focal lesion or hydronephrosis.RETROPERITONEUM, LYMPH NODES: No upper abdominal lymphadenopathy.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: No significant abnormality noted.OTHER: Basilar scarring/infiltration.
1.Findings most compatible with a metastasis in the right lobe of the liver as described.2.Horseshoe kidney. 