1*NORMAL PARATHYROID GLANDS AND 50% OF HYPERPLASTIC GLANDS ARE NOT VISUALIZED BY THIS (TL-TC) TECHNIQUE.*

2*THE MAJORITY OF PARATHYROID ADENOMAS ARE ASSOCIATED WITH THE LOWER ASPECT OF THE THYROID LOBES*

3*THE MAJORITY OF PARATHYROID ADENOMAS WILL BE APPARENT FROM SUBJECTIVE EVALUATION OF THE 201TL AND 99mTC04 IMAGES*

4*COMBINED 201TL/99mTCO4 IMAGING HAS APPROXIMATELY 70% SENSITIVITY FOR A PARATHYROID ADENOMA*

5*THE MAJORITY OF PARATHYROID CARCINOMAS ARE FUNCTIONAL, BUT NON-FUNCTIONING TUMOURS MAY OCCASIONALLY BE FOUND*

6*IN THE MORE TYPICAL CASES OF SECONDARY HYPERPARATHYROIDISM APPROXIMATELY 50% OF HYPERPLASTIC GLANDS WILL NOT BE VISUALIZED*

7*FALSE POSITIVE PARATHYROID SCANS MAY BE OBTAINED WHEN THE THYROID CONTAINS A NON-FUNCTIONING OR AUTONOMOUSLY FUNCTIONING NODULE*

8*EXTREME CAUTION MUST BE EXERCISED WHEN INTERPRETING A PARATHYROID STUDY IN THE PRESENCE OF THYROID DISEASE. WHEN EXTENSIVE MULTINODULAR CHANGE IS PRESENT*