METASTASIS TO LUNG

　

Discussion :

METASTASIS TO LUNG

Pulmonary metastases occur in 30% of all malignancies; mostly hematogenous
Age:>50 years (in 87%)

Incidence of pulmonary metastases :
mnemonic: "CHEST"
-Choriocarcinoma 60%

-Hypernephroma / Wilms tumor 30 / 20%

-Ewing sarcoma18%

-Sarcoma (rhabdomyo- / osteosarcoma)21 / 15%

-Testicular tumor12%

-multiple nodules (in 75%) of varying sizes (most typical), 82% subpleural

-fine micronodular pattern: highly vascular tumor (renal cell, breast, thyroid, prostate carcinoma, bone sarcoma, choriocarcinoma) -pneumothorax (2%): especially in children with bone tumors

CT:
-noncalcified multiple (>10) round lesions >2.5 cm likely to be metastatic