Table 1.

Diagnostic criteria for specific types of parathyroid adenomas.

Type	Criterion	Ref.
Oncocytic adenoma	Oncocytes compose >75% of the tumour	Erickson et al., 2022 [12]
Water-clear adenoma	Entirely composed of water-clear cells
Cystic adenoma	Extensive cystic change affecting >50% of parenchyma
Lipoadenoma	Stromal fat represents >50% of the tumour