Masashi Kusakabe

Objectives The purpose of this study was to investigate the clinical and imaging features of solid pseudopapillary neoplasms (SPNs) in men and to compare with those in women. Methods One hundred twenty-two patients (38 men and 84 women) with histologically confirmed SPNs from seven institutions were retrospectively analyzed. Clinical data, including demographics and preoperative diagnoses, were reviewed, and imaging characteristics on computed tomography, magnetic resonance imaging, and ¹⁸F-fluorodeoxyglucose positron emission tomography were assessed. Clinical and imaging characteristics were compared between men and women. Results Men were significantly older than women (mean age: 43.7 years vs. 31.1 years, p < 0.001) and had smaller tumors (mean size: 28.5 mm vs. 38.5 mm, p = 0.014). Regarding preoperative diagnosis, SPN was suspected less frequently in men (p < 0.001), with a higher rate of biopsy (p = 0.006). Imaging characteristics revealed that SPNs in men had fewer hemorrhagic changes (p = 0.035), more frequent internal calcifications (p = 0.003), and a higher proportion of solid components (p = 0.009). In women, tumor size (ρ = − 0.292, p = 0.007) and the proportion of solid components (ρ = − 0.276, p = 0.011) negatively correlated with age, whereas no correlations were observed in men. Conclusion SPNs in men exhibit distinct clinical and imaging characteristics, including older age, smaller size, a greater proportion of solid components, and fewer degenerative features compared with those in women. Recognizing these sex-specific differences is important for improving diagnostic accuracy and guiding the optimal management of patients with SPNs. Graphical Abstract

Cases of percutaneous transluminal renal angioplasty for renal artery stenosis are increasing. However, percutaneous transluminal renal angioplasty with stenting for stenotic venous bypass grafts has never been reported. Herein, the authors describe two cases of percutaneous transluminal renal angioplasty with stenting for a stenotic venous bypass graft. The patients in both cases had undergone bypass grafting using autologous saphenous veins, which were anastomosed directly to their abdominal aortas. We successfully conducted percutaneous transluminal renal angioplasty with stenting. One of the keys for technical success is an appropriate selection of guiding catheter compatible with postoperative nonanatomical vasculature, and the other is relatively high pressure dilation for venous stenosis.