Introduction: Parathyroidectomy is the definitive treatment for primary hyperparathyroidism (PHPT) due to parathyroid adenoma. However, surgery may be contraindicated in patients with significant comorbidities. Ultrasound-guided percutaneous ethanol ablation (PEA) is a minimally invasive alternative that induces biochemical remission through targeted destruction of hyperfunctioning tissue. We report a case of PHPT successfully managed with PEA in a patient unfit for surgery due to cardiac dysfunction. Case: In 2023, a 53-year-old female with stage IB breast carcinoma was found to have persistent hypercalcemia (2.68– 3.59 mmol/L) during chemotherapy and post-mastectomy follow-up. Evaluation excluded bone metastases. Biochemical assessment demonstrated elevated intact parathyroid hormone (iPTH) levels 38.6 pmol/L (Reference: 1.6–6.0 pmol/L), hypophosphatemia (0.42–0.80 mmol/L), and elevated alkaline phosphatase (ALP) 215–309 U/L (30–120 U/L)—consistent with PHPT. Tc-99 m sestamibi scintigraphy localized a 1.1 × 1.5 × 1.2 cm hyperfunctioning parathyroid adenoma. Initial management prioritized oncological therapy, including trastuzumab for 1 year. Hypercalcemia was intermittently controlled with intravenous hydration and zoledronic acid when calcium exceeded 3 mmol/L. Her disease was complicated with severe osteoporosis (DEXA T-score −3.3) with vertebral fractures, renal impairment requiring cessation of alendronate, and medullary nephrocalcinosis on computed tomography surveillance. Following completion of cancer therapy, she was evaluated for parathyroidectomy. Preoperative assessment revealed NYHA class II heart failure, with reduced ejection fraction (36%) and severe tricuspid regurgitation attributed to trastuzumab-related cardiomyopathy. Despite optimal medical therapy, she was deemed high-risk for surgery. Cinacalcet failed to achieve sustained calcium control with levels exceeding 3 mmol/L. She was therefore referred for PEA. Post-procedure, iPTH decreased 80% by Day 5 (54.9–10.6 pmol/L), with sustained normocalcemia (2.25 mmol/L) at 10 days without further need for cinacalcet. Conclusion This case illustrates that PEA can serve as definitive therapy for PHPT in patients unsuitable for surgery. It provides rapid and sustained biochemical control, while avoiding operative risk, supporting its role in individualized management.
Hyperparathyroidism, Primary ; Ethanol

Cavernous sinus dural arteriovenous fistula (CS-DAVF) is an arteriovenous shunt where there is fistulous blood flow from the dural arteries from the internal or external carotid artery into the cavernous sinus. The current mainstay of therapy is endovascular treatment. We present a case of restrictive type of CS-DAVF in a 75-year-old male who presented with right eye symptoms. He was treated with embolisation using trans-radial artery access for angiographic runs and a median cubital vein access navigating into the cavernous sinus for coil deployment. This technique completely avoids the conventional technique of a femoral approach and confines all access to the arm. Therefore, there are less risks and complications associated with an arm access, improves patients’ comfort and mobility post procedure. Transradial artery and cubital vein access allows for a safe and convenient alternative technique using the arm as compared with conventional transfemoral approach for treatment of CS-DAVF.

Cavernous sinus dural arteriovenous fistula (CS-DAVF) is an arteriovenous shunt where there is fistulous blood flow from the dural arteries from the internal or external carotid artery into the cavernous sinus. The current mainstay of therapy is endovascular treatment. We present a case of restrictive type of CS-DAVF in a 75-year-old male who presented with right eye symptoms. He was treated with embolisation using trans-radial artery access for angiographic runs and a median cubital vein access navigating into the cavernous sinus for coil deployment. This technique completely avoids the conventional technique of a femoral approach and confines all access to the arm. Therefore, there are less risks and complications associated with an arm access, improves patients’ comfort and mobility post procedure. Transradial artery and cubital vein access allows for a safe and convenient alternative technique using the arm as compared with conventional transfemoral approach for treatment of CS-DAVF.