"Haemorrhagic pulmonary metastases are those which tend to be complicated by pulmonary haemorrhage within them, resulting in characteristic imaging appearances. Metastases of some tumour histologies are more likely to haemorrhage -- knowledge of this can help refine the differential diagnoses."
"If there is a peri-tumoural haemorrhage this may be seen as a nodule or mass which is surrounded by a halo of ground-glass opacity (CT halo sign) or an ill-defined fuzzed-out margin."
Expected headings
"CT chest"