The ability to localize parathyroid adenoma with B ultrasound, CT scan and thal-lium-technetium scanning (TTS) was eraluated in 41 randomly selected patients with parathyroid adenoma proved pathologically from May, 1985 to May, 1993. The results indicated that the sensitivity was 92.86%, 73.91% and 33.3%; the specificity, 95.65%, 94.2% and 100%; and the accuracy, 95%, 89.1%, 83.3% in above three images examinations. Therefore, the predictable positive rates were 86.6%, 80.95 and 100%; the predictable nagative rates were 97.78%, 91.55%, 0%. There was no significant difference between B ultrasound and CT scan (P > 0.05) in the detection of the location of adenomas. We suggest that B ultrasound could be the first choice in the detection of the location of parathyroid adenoma before surgery, and the CT scan be applied for the unascertained patents who had B ultrasound exam, or surgical exploration, and those with suspected mediastinal adenoma.
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