Fig 4.

A 47-year-old woman with primary hyperparathyroidism (parathyroid hormone = 164 pg/mL, Ca²⁺ = 10.8 mg/dL). Axial arterial phase contrast-enhanced image from MR perfusion data demonstrates a PTA (arrow) in the left tracheoesophageal groove. Contrast-time curve analysis from ROIs placed over the PTA, thyroid gland, and a cervical lymph node shows significantly faster TTP and higher wash-in and significant washout values in the PTA compared with the thyroid gland and cervical lymph node. PTA: TTP, 30 seconds; wash-in, 5.6; washout, 0.64 Thyroid: TTP, 38 seconds; wash-in, 3.8 seconds; washout, 0.43 seconds. Lymph node: TTP, 62 seconds; wash-in, 2.9; washout, 0.23.