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原发性甲状旁腺功能亢进症(primary hyperparathyroidism,PHPT) 是因甲状旁腺组织的原发病变引起甲状旁腺激素(parathyroid hormone,PTH)分泌过多,继而导致的一系列病变,包括高钙血症、肾钙质沉着症、肾结石、肾钙重吸收、尿磷排泄增加和以皮质骨为主的骨吸收增加等[1]。99Tcm-MIBI SPECT/CT双时相平面显像操作简单,是PHPT的常规影像检查方法[2]。但是,有研究结果显示,当病灶的质量<500 mg时,显像的假阴性率会升高[3]。王静等[4]的研究结果表明,当甲状旁腺质量较小时,其病灶的长径及体积也比较小,99Tcm-MIBI SPECT/CT双时相平面显像检测病灶的灵敏度也相对较低。本文中我们报道了1例初诊99Tcm-MIBI SPECT显像结果阴性、99Tcm-MIBI SPECT/CT跟踪显像结果阳性的不典型甲状旁腺小腺瘤患者,希望能在临床高度怀疑PHPT,但常规影像检查未发现病灶时,充分发挥99Tcm-MIBI SPECT/CT显像的诊断效能,为临床医师的诊断提供参考。
以反复骨折为主诉的不典型甲状旁腺腺瘤99Tcm-MIBI SPECT/CT跟踪显像1例
99Tcm-MIBI SPECT/CT tracking imaging of atypical parathyroid adenoma with recurrent fracture as the chief complaint: a case report
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摘要: 笔者报道了1 例以反复骨折、高甲状旁腺激素水平、初诊99Tcm-甲氧基异丁基异腈(MIBI)SPECT显像结果阴性、99Tcm-MIBI SPECT/CT跟踪显像结果阳性为特点的不典型甲状旁腺腺瘤患者的影像及临床特征,结合相关文献进行回顾分析,探讨当CT、超声定位诊断结果均为阴性,甚至 99Tcm-MIBI SPECT/CT显像结果仍为阴性时的诊断思路,以期提高对不典型甲状旁腺腺瘤的认识及早期诊断水平,避免临床漏诊。Abstract: This paper reports the imaging and clinical features of a patient with an atypical parathyroid adenoma characterized by recurrent fractures, high parathyroid hormone level, negative 99Tcm-methoxyisobutylisonitrile (MIBI) SPECT imaging at initial diagnosis and positive 99Tcm-MIBI SPECT/CT tracking imaging at follow-up. By reviewing and analyzing relevant literature, this paper aims to explore the diagnostic approach when both CT and ultrasound localization diagnostic results are negative, and even when the 99Tcm-MIBI SPECT/CT imaging are still negative, in order to improve the understanding and early diagnosis of atypical parathyroid adenoma and avoid clinical missed diagnosis.
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