 For the CT-guided core biopsy of the lung, subcutaneous, andor lymph node biopsy, a tissue sample is withdrawn from an organ or suspected tumor mass using a very thin needle and a syringe. The needle is guided while being viewed by the physician on a CT scan. Any site that can be safely biopsied will be considered for the collection of tissue. Sites not commonly biopsied include kidneys, adrenal glands, and brain. 