Imaging Characteristics and Interpretation Strategy for Renal Hyperparathyroidism: A Retrospective 4-Dimensional...

Area of Science:

• Radiology
• Endocrinology
• Surgical Oncology

Background:

• Uncontrolled renal hyperparathyroidism (RHPT) necessitates parathyroidectomy for treatment.
• Accurate identification of all parathyroid glands is crucial for successful parathyroidectomy.
• Standard imaging enhancement patterns may not effectively highlight parathyroid lesions in RHPT.

Purpose of the Study:

• To characterize the imaging features of parathyroid glands in patients with RHPT using 4-dimensional computed tomography (4DCT).
• To propose a 4DCT interpretation algorithm for improved identification of problematic parathyroid glands in RHPT.

Main Methods:

• Retrospective analysis of 4DCT scans from 27 patients with RHPT who underwent preoperative imaging for parathyroidectomy.
• Identification of 97 pathology-confirmed parathyroid lesions, with 86 detected on 4DCT.
• Assessment of lesion and thyroid gland attenuation in arterial and venous phases.

Main Results:

• Parathyroid lesions in RHPT did not exceed thyroid attenuation in the arterial phase (P < .001).
• Parathyroid lesions demonstrated lower attenuation than the thyroid in the venous phase (P < .001).
• A significant majority (94.2%) of lesions exhibited a Type B enhancement pattern (lower venous phase attenuation).

Conclusions:

• Parathyroid lesions in RHPT show a distinct "Type B" enhancement pattern on 4DCT, differing from primary hyperparathyroidism.
• This pattern makes RHPT parathyroid glands less conspicuous during the arterial phase of imaging.
• A tailored 4DCT interpretation strategy is proposed to enhance the detection of these challenging glands.