CD34 and parathyroid gland adenoma: Although no differences were found in relation to the prevalence of parathyroid cell type in the multiglandular parathyroid disease (former hyperplasia) and parathyroid adenomas, considering the remarkable heterogeneity of the parenchymal phenotype described in these lesions [83] and that TCs/CD34+ SCs are in contact with parenchyma, future quantitative explorations of the numbers and density of TCs/CD34+ SCs are required.