Hello and thank you for the question. Answers given are for informational purposes only and are not meant to replace an exam by an in-person.
I am Dr. Sohaib, a practicing Internal Medicine Specialist and i will do my best to help you today.
This is variable from one centre to another.
In general this can take less than a week ( usually 2/3 days) to get the PET scan results back to the physician who ordered the test.
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Which kind of biopsy do you think is better...needle or open?
This again depends upon number of factors.
Site of the cancer.
Previous attempts at biopsy.
Fitness for anesthesia and open biopsy.
Patient's own choice.
I would certainly prefer needle biopsy due to minimal invasion and least possible chances of complications.
However, which procedure suits best a particular patient depends upon the particular clinical scenario and the decision has to be made in close liaison between the physician, pathologist/surgeon (who will perform the biopsy) and the patient.