Influence of Multigland Parathyroid Disease on 99mTc-Sestamibi SPECT/CT

• Published in: Clinical nuclear medicine 2016-04, Vol.41 (4), p.282-288
• Main Authors: Nichols, Kenneth James, Tronco, Gene G, Palestro, Christopher J
• Format: Article
• Language: English
• Subjects: Adult; Female; Humans; Hyperparathyroidism, Primary - diagnostic imaging; Male; Middle Aged; Multimodal Imaging; Parathyroid Glands - diagnostic imaging; Radiopharmaceuticals; Sensitivity and Specificity; Technetium Tc 99m Sestamibi; Tomography, Emission-Computed, Single-Photon; Tomography, X-Ray Computed
• ISSN: 0363-9762; 1536-0229
• DOI: 10.1097/RLU.0000000000001115

PURPOSETc-sestamibi (MIBI) imaging is performed for preoperative parathyroid lesion localization in patients with primary hyperparathyroidism. Decreased sensitivity in multigland disease (MGD) compared with single-gland disease (SGD) is well recognized for planar and SPECT imaging, but few data are available on MIBI SPECT/CT in MGD. METHODSWe retrospectively analyzed 246 patients with primary hyperparathyroidism who underwent preoperative MIBI SPECT/CT. Surgical and pathology reports were used to confirm numbers, weights, and locations of excised glands. Two experienced physicians independently read MIBI SPECT/CTs, grading lesion certainty on a 5-point scale (“definitely normal” to “definitely abnormal”). RESULTSThree hundred one parathyroid lesions were excised at surgery. Thirty-nine patients (16%) had MGD, and 207 patients (84%) had SGD; 26 patients had 2 lesions, 10 had 3 lesions, and 3 had 4 lesions. Lesion weights were significantly lower in MGD than in SGD (390 ± 604 vs 866 ± 933 mg, P < 0.0001) and decreased with increasing numbers of lesions (P < 0.0001). MIBI SPECT/CT was less sensitive for MGD than SGD (66% vs 98%, P < 0.0001). Sensitivity was lower for 66 MGD lesions matched to 66 SGD lesions (64% vs 98%, P < 0.0001) and decreased with increasing lesion numbers (ρ = −0.45, P < 0.0001), despite similar weights (526 ± 678 vs 525 ± 686 mg, P = 0.99) and similar locations (P = 0.47). Specificity was similar for MGD (95%) and SGD (90%). CONCLUSIONSTc-MIBI SPECT/CT sensitivity is significantly lower in MGD than in SGD. This does not appear to be related to lesion weight or location.