The details of 7 patients with hyperparathyroidism in whom 8 intrathyroid hyperfunctioning parathyroid glands were located are presented. Seven of the 8 glands were inferior parathyroids and this observation is discussed in the light of current embryological teaching. The intrathyroidal hyperfunctioning parathyroid is considered to be a potential cause of failed parathyroid surgery and, therefore, when an inferior parathyroid gland is missing, it is recommended that the lower pole of the thyroid be incised and, if necessary, a thyroid lobectomy performed.
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Wheeler et al. (1987) studied this question.