Hibernoma in the renal sinus: A case mimicking malignancy.

Introduction: Hibernomas are benign tumors of brown adipose tissue. Hibernoma in the renal sinus is extremely rare. Herein, we present the third known case of renal hibernoma.

Impact of the coronavirus disease 2019 pandemic on the number of undergoing radical nephroureterectomy and postoperative adjuvant systematic therapy for upper tract urothelial carcinomas in Japan: A multicenter retrospective study.

Objectives: The coronavirus disease 2019 pandemic has affected cancer management worldwide. For upper tract urothelial carcinomas, delays in treatments are not recommended even during the pandemic. We investigated the impact of the pandemic on patients with these carcinomas who underwent radical nephroureterectomy (RNU) and adjuvant systematic therapy before and after COVID-19 spread in Japan.

A case of robot-assisted adrenalectomy performed for an adrenal tumor (anastomosing hemangioma) exceeding 7 cm.

Introduction: Anastomosing hemangioma in the adrenal area is extremely rare. We report a large anastomosing hemangioma in the adrenal area that underwent robot-assisted adrenalectomy.

Case Presentation: A 49-year-old man with left back pain underwent magnetic resonance imaging (MRI) that revealed a tumor in the left adrenal area; it was diagnosed as nonfunctional endocrinologically.

Retroperitoneoscopic resection of a primary retroperitoneal paraganglioma occurring between the aorta and vena cava: A case report.

A 67-year-old man presented with lower limb weakness, palpitations, and insomnia. His urinary total metanephrine and normetanephrine levels were high. Computed tomography showed a 48 × 34-mm oval mass on the dorsal side of the pancreas and portal vein between the aorta and vena cava.