- Metastatic tumorsLiver lesionsCore needle biopsyFine-needle aspirationHepatocyte lesionsPrimary tumorDefinite diagnosisDiagnostic challengeNeedle biopsyAncillary studiesHepatocellular carcinomaNeedle aspirationCytomorphologic featuresDiagnostic pitfallsLesion lesionsLesionsCytological featuresTumorsBiopsyMorphologic comparisonCholangiocarcinomaCarcinomaLiverDiagnosis