Purpose: [99mTc]Tc-sestamibi SPECT/CT (MIBI SPECT/CT) is a promising tool to differentiate benign and malignant renal tumours. We tested feasibility of recruitment to a prospective, multi-centre diagnostic test evaluation study of MIBI SPECT/CT for T1 renal tumours. // Methods: Consecutive adult patients with a newly-diagnosed clinical T1 (cT1) renal mass (2–7 cm) presenting to participating sites December 2022 - February 2024 were recruited and underwent MIBI SPECT/CT prior to histopatholo...