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This is a video iof a stereotactic biopsy on a patient with an intracranial lesion.
Priot to the biopsy, the patient has had a CT scan
with at stereotactic frame attached to her cranium.
Coordinates for the biopsy path are then calculated.
This is done by fusing the CT and MR images on a computer.
The lesion is located, relative to the frame, and exact coordinates are calculated, in three dimensions.
These coordinates are set on the stereotactic frame, and the needle is calibrated.
The frame is attached to the patient, and the point of entry is marked on the skin.
Local anastesia is administered to the biopsy area.
A vertical skin incision is made with a scalpel,
and the point of entry is marked on the cranium.
A small hole is drilled in the cranium.
The durameter is opened with a cross-shaped incision.
The biopsy needle is inserted through the hole in the cranium, and in to the lesion.
The needle is rotated, while aspirating with a syringe.
Several biopsies are taken from different depths.
The biopsies are placed in formalin.
Two more biopsies are taken for cryosectioning.
Finally, the wound is cleansed and closed in two layers.

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