Table 1.

Characteristics of our patients population affected by primary hyperparathyroidism

	Patients in whom focused miminally invasive parathyroidectomy was planned	Patients in whom bilateral neck exploration was planned
Total patients number	320	107
Solitary PA and normal thyroid gland*	320	0
Solitary PA and nodular goitre*	0	51
Parathyroid multigland disease	0	27
Negative sestamibi scan	0	21
History of familial hyperparathyroidism	0	3
History of multiple endocrine neoplasia (MEN)	0	4
History of neck irradiation	0	1
Previous thyroid/parathyroid surgery	75	18
Mean (and range) levels of preoperative serum calcium (mg/dl)	12.1 (10.6 – 13.8)	12.2 (10.6 – 13.7)
Mean (and range) levels of preoperative serum PTH (pg/ml)	196 (84 – 351)	221 (91 – 336)
Mean (and range) operating time, minutes	32 (15 – 58)	78 (52 – 107)
Mean (and range) hospital stay, days	1.2 (1 – 2)	2.5 (2 – 5)
Mean (and range) post-surgical follow-up, months	15.3 (18 – 70)	15.9 (18 – 83
Recurrent hyperparathyroidism	0 cases	4 cases; 3.7% (all multigland disease at first diagnosis)

PA = parathyroid adenoma

*Thyroid gland evaluated by thyroid scan and ultrasound