Outline. Primary Hyperparathyriodism. SPECT/CT in Parathyroid Localisation. Ann-Marie Quigley Nuclear Medicine Royal Free Hospital London
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1 SPECT/CT in Parathyroid Localisation Ann-Marie Quigley Nuclear Medicine Royal Free Hospital London Outline Pathophysiology Current guidelines SPECT/CT the evidence SPECT/CT in clinical scenarios MGD, Nodular goitre Impact on surgery RFH protocol and data Primary Hyperparathyriodism Sporadic: commonest cause hypercalceamia outpatient populations (F: 1/500, M: 1/2000) 80-85% adenoma 15-20% multiple glands (double adenomas or hyperplasia) 1% carcinoma Hereditary disorders 10% cases 1
2 Secondary hyperparathyroidism Compensatory gland hypertrophy secondary to hypocalcaemia eg Chronic Kidney Disease Tertiary hyperparathyroidism Autonomous function of parathyroid tissue after longstanding secondary hyperparathyroidism Parathyroid Embryology Pharyngeal Pouches Ist ET 2 nd Tonsil 3 rd Inf PTH 4 th Sup PTH Thymus Foramen Caecum TG duct Thyroid Superior glands (4 th pouch) minimal descent Inferior glands (3 rd pouch) descend further with thymus Gland Location Normal parathyroid gland Superior posterior to upper 2/3 of thyroid. Inferior anterior, lateral or posterior to inferior pole of thyroid 4 glands (2-6) Ectopic 20% Any position above / below thyroid Sup PTH - lower 1/3 of thyroid 2
3 Superior Adenoma located postero-inferiorly Surgical Management Excision of hyper functioning glands Historically four gland exploration Move towards minimally invasive surgery IOPTH monitoring (cut off variable) Other Techniques: eg radio-guided using gamma probe EANM Guidelines 2009 Dual tracer planar subtraction 99m Tc MIBI + 99m Tc pertechnetate / 123 I pinhole (LFOV view also needed) Dual tracer planar subtraction + SPECT MIBI Dual phase planar with 99m Tc MIBI +/- SPECT 10 mins and 120 mins ( washout ) Overall sensitivity variable: 80-90% 3
4 EANM Guidelines 2 SPECT/CT: Improves accuracy + reporter confidence did not demonstrate a clear superiority or clinical impact of SPECT/CT over SPECT where the end point is is success of surgery Conclusion: SPECT/CT useful in ectopic glands and distorted neck anatomy SPECT vs SPECT/CT 48 patients (32 surgery) MIBI Planar + SPECT/CT performed Added value of CT component ie SPECT vs SPECT/CT (2 reporters) Results: - CT: helpful in ectopic glands - no difference in identification rate of adenoma - better inter-observer agreement on location with SPECT /CT (29/48 vs 45/48) Conclusion: - SPECT /CT: no added value over SPECT - Reserve for ectopic glands Gayed 2005 JNM46: Ectopic Gland pre-vascular space 4
5 SPECT vs SPECT CT 16 patients (10 1 HPT, 6 2 HPT) Planar, SPECT and SPECT/CT Comparison with surgical findings Results Planar SPECT SPECT/CT Sensitivity 1 HPT 57% 100% 100% Sensitivity 2 HPT 43% 64% 64% Localization (1 ) - 61% 100% 3/16 cases SPECT/CT changed management: retro-tracheal location detected on SPECT/CT only Serra et al 2006 Radiol Med 111: Which Protocol? Single v Dual Phase? Planar, SPECT or SPECT/CT? 98 pts surgical follow-up (1 HPT) Planar + SPECT/CT (both early and late) Sensitivity of correct localization per patient Results Protocol Sensitivity per lesion single phase early planar 34% single phase delayed planer 45% dual phase planar 57% early SPECT 54% dual phase SPECT 64% 73% early phase SPECT/CT with any delayed 73% phase (planar, SPECT or SPECT/CT) Early SPECT/CT combined with any delayed imaging most sensitive SPECT CT localized superior glands within tracheooesophageal groove (near to RLN) Lavley et al 2009, JNM
6 123 I and 99m Tc MIBI subtraction SPECT vs SPECT/CT 61 patients: subtraction SPECT/CT SPECT vs SPECT/CT Results SPECT SPECT/CT Sensitivity* 71% 70% Specificity* 48% 96% * per lesion Less false positives with SPECT/CT EANM guidelines: not recommended (reduced sensitivity) Sensitivity per patient is higher (88% and 86%) Neuman et al 2008 JNM 49: I and 99m Tc MIBI subtraction SPECT vs SPECT/CT 2 EANM patients Sensitivity 90%, Specificity 82%, PPV 93% Low et al 2011 EJNM 38 (suppl 2: S167) 54 patients Sensitivity 92%, Specificity 83% Image courtesy of Dr C Low Ciappuccini et al 2011, EJNM 38 (suppl 2: S167) Multiglandular Disease MGD: 2 (or more) glands affected 1 HPT: minimally invasive surgery 2 and 3 PTH : 4 gland exploration Wimmer et al, 2010 SPECT vs SPECT/CT in MGD Retrospective review of pre-op imaging in 29 pts with MGD 6 1 HPT, 23 with 2 or 3 HPT SPECT, CT (post contrast), SPECT with CT fusion 6
7 Results Locating all glands MGD detected CT SPECT SPECT/CT 37% 13% 47% 66% 17% 66% SPECT/CT more sensitive than SPECT overall MGD (1 HPT) : SPECT/CT - 5/6 SPECT - 0/6 Conclusion 1 HPT: SPECT/CT useful for predicting MGD (pre-op planning) 2 and 3 HPT : SPECT/CT not useful Wimmer et al 2010 Langenbecks Arch Surg 395: Four Gland Hyperplasia Double Adenoma MEN1 Axial upper Axial lower 7
8 Double Adenoma SPECT vs SPECT CT with Nodular Goitre 33 pts 18 planar + SPECT 13 planar + SPECT/CT Compared pre-op imaging with surgical findings Results SPECT SPECT/CT lateralization 80% (88%) 94% (93%) quadrant 56% (86%) 86% (96%) Mean op time 56 mins 38mins SPECT/CT better quadrant localization MGD: identified on SPECT/CT only Pata et al 2010 Thyroid 20: Impact of MIBI SPECT/CT on Surgical Management 36 pts (1 HPT) Planar + SPECT/CT pre-op Compared with surgical findings No additional lesions found on SPECT/CT (sensitivity 92%) SPECT/CT had impact on surgery in 39% (10 ectopic, 4 cervical) - Ease of accessibility (6 avoided sternotomy) - Decreased op time - Smaller incision Krausz et al 2006 World J Surg 30:
9 Case A Case B Retro-eosophageal Adenoma Para-tracheal Adenoma Financial implications of SPECT/CT 55 patients : 27 SPECT, 28 SPECT/CT SPECT SPECT/CT lateralization 79% (82%) 97% (96%) quadrant 61% (90%) 87% (97%) Mean op time 62 mins 36mins Ectopic glands: 4 in SPECT, 3 in SPECT/CT SPECT : 2 incorrectly lateralized 2 aberrant position not detected SPECT/CT : 3/3 correctly localized Saving per patient: 98 (95% CI ) Pata et al, 2011 Ann Surg Oncol 18: Technique at RFH 855 MBq MIBI SPECT at 15 mins SPECT/CT at 120 mins 7.6 msv CT neck /thorax 130 KeV, 40mAs 2mSv 9
10 1.2 msv 2 msv RFH DATA Adenoma (histologically confirmed) 41/47 detected on MIBI Sensitivity 87% 36/38 correctly localized Glandular Hyperplasia Detected 1/6 Begum et al 2011 EANM Conclusion SPECT/CT higher sensitivity than SPECT for ectopic, re-explorations and MGD (1 PTH) than SPECT No consensus over sensitivity of SPECT vs SPECT/CT in eutopic glands Superior localization with SPECT/CT SPECT/CT has positive impact on surgery 10
11 Thank You 11
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