Radionuclide imaging for hyperparathyroidism (HPT): which is the best technetium-99m sestamibi modality?
BACKGROUND
To determine the utility of available radionuclide imaging modalities for preoperative parathyroid localization, we compared the accuracy of 4 types of technetium-99m ((99)Tc) sestamibi-based scans.


METHODS
Over 5 years, 833 patients with sporadic primary hyperparathyroidism underwent either (99)Tc-sestamibi with planar views (Planar; n = 138); sestamibi single photon emission computed tomography (SPECT; n = 165); SPECT with thyroid (123)I-subtraction phase (SPECT/(123)I; n = 350); or SPECT combined with conventional CT (SPECT/CT; n = 180). The accuracy of each modality was determined on the basis of intraoperative parathyroid pathology, defined as single adenoma or multigland disease.


RESULTS
Planar scans had significantly more false negatives (no tumor visualized) than SPECT-based scans (P < 0.01), but positive predictive values were similar. A false-negative scan was present in 38% of Planar scans, 27% SPECT, 4% SPECT/(123)I, and 17% SPECT/CT, with single adenoma found at operation in 77%, 64%, 53%, and 74%, respectively. When a scan had a single focus of uptake, SA was found at that location in 77%, 85%, 68%, and 87%, respectively. SPECT, SPECT/(123)I, and SPECT/CT did not significantly reduce the false-positive rate.


CONCLUSIONS
We recommend obtaining multiplanar SPECT-based imaging, which offers 3-dimensional localization and improved detection of parathyroid tumors when compared with Planar scans. A negative scan did not predict multigland disease.
Sharma
Jyotirmay
J
Department of Surgery, Emory University School of Medicine, Atlanta, GA 30322, USA.
Mazzaglia
Peter
P
Milas
Mira
M
Berber
Eren
E
Schuster
David M
DM
Halkar
Raghuvee
R
Siperstein
Alan
A
Weber
Collin J
CJ
D006801:Humans; D049950:Hyperparathyroidism, Primary / Q000000981:diagnostic imaging* / Q000473:pathology; D007457:Iodine Radioisotopes; D010280:Parathyroid Glands / Q000000981:diagnostic imaging / Q000473:pathology; D010282:Parathyroid Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology; D011237:Predictive Value of Tests; D011877:Radionuclide Imaging / Q000379:methods*; D019275:Radiopharmaceuticals; D012189:Retrospective Studies; D013382:Subtraction Technique; D017256:Technetium Tc 99m Sestamibi; D014055:Tomography, Emission-Computed / Q000379:methods; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods
D007457:Iodine Radioisotopes; D019275:Radiopharmaceuticals; D017256:Technetium Tc 99m Sestamibi