The different biokinetic behaviour of radioactive tracers which can be monitored by nuclear medicine procedures may be helpful in the diagnosis or differential diagnosis of tumours or tumour-like lesions of the liver or pancreas: autologous red blood cells in the detection of haemangiomas; iminodiacetates in delineation of focal nodular hyperplasia, resp. liver adenomas versus other tumours; colloidal albumin in differentiating focal fatty infiltration from diffuse infiltration by metastases; monoclonal antibodies in revealing liver metastases or abscesses, resp. pancreas neoplasms. In general the clinical suspected diagnosis and the result of morphologic imaging modalities determine the use of the appropriate radioactive tracers.