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metastasis to brain across veins?
1-long thoracic .v
2-lateral thoracic vein
3-intercostal vein
or any other one if those not correct

first could you tell us where this vein scome from , drain..so we wil go from there ??????

legs?

Intercostals drain toIVC via Azygos vein on the right side.

First among the MC metastasis to the brain are
1/Breast CA, Lung CA, Ovarian CA , Kidney Ca, esophageal Ca, Head and Neck Ca

2/Metastatic spread to the brain through blood circulation is (1) mostly via arterial circulation and (2) less often via Batson venous plexus (pelvic and GI tumors).

3/Since arterial blood must pass through the lungs before entering the brain, and larger aggregates of tumor cells are filtered out in the capillaries, many emboli traveling to the brain via the arterial route originate either from a primary lung tumor or a metastatic site in the lung.