A 50 year old man suffering from carcinoma of prostate showed areas of sclerosis and collapse of T10 and T11 veebrae in X-ray.The spread of this cancer to the above veebrae was most probably through
Sacral canal
Lymphatic vessels
Internal veebral plexus of veins
Superior rectal veins
C. i.e. Internal veebral plexus of veinsValve less communication exist between prostatic & veebral venous plexuses through which Prostatic carcinoma can spread to the veebral column & to the skull.QThis communicating plexus is k/a Bateson's plexusQBony metastasis of prostate is mainly osteoblastic (sclerotic)QPelvis is the most common site for bony metastasisQ followed by Lumber > Thoracic veebra.