The Midwest Head and Neck Cancer Consortium Multi-Institutional Parathyroid Registry

This will be a multi-institutional prospective study in which patients that have undergone parathyroidectomy with intra-operative PTH assessment. The success of minimally invasive parathyroidectomy without and with intra-operative PTH will be assessed for each patient. Success for exploration without intra-operative PTH will be defined as directed exploration with detection of an abnormal parathyroid in the location suggested by imaging. Success with intra-operative PTH will be defined as per standard protocols (50% or \> decrease in intra-operative PTH following excision).