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  • Webster's Revised Unabridged Dictionary
    • a Perivascular Around the blood vessels; as, perivascular lymphatics.
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Century Dictionary and Cyclopedia
    • perivascular Surrounding a vascular structure, as a blood-vessel; inclosing or containing an artery or a vein: as, a perivascular network of sympathetic nervous filaments about an artery.
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Chambers's Twentieth Century Dictionary
    • adj Perivascular per-i-vas′kū-lar surrounding a vascular structure.
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In literature:

The perivascular sheaths were crowded with small round cells and the meninges were congested.
"Handbook of Medical Entomology" by William Albert Riley
The perivascular lymph spaces which exist in the brain seem to be for the purpose of making these limited hyperemias easier.
"Psychotherapy" by James J. Walsh

In news:

One of the most likely issues is that you have a (perivascular) injection, meaning the substance is not in the vein but is outside and close to the vein.