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Background: Although anastomosing hemangiomas are very rare and benign vascular neoplasms, these tumors are more common among patients with end-stage kidney disease. Incidental finding of these tumors in the kidney or adrenal gland has been reported. Herein, we describe a case in which an anastomosing hemangioma was misdiagnosed as a renal cell carcinoma before kidney transplant.Case Presentation: A 35-year-old woman with lupus nephritis was admitted to our emergency department for suspected uremic symptoms of nausea and general weakness. She had received hemodialysis due to end-stage kidney disease, and a living-donor kidney transplantation from her father was planned. On pre-operative contrast-enhanced computed tomography and magnetic resonance imaging, a 1.7 cm renal cell carcinoma was observed in the right kidney. On staining after radical nephrectomy, irregularly shaped vascular spaces of various sizes were observed, with these spaces having an anastomosing pattern. As the findings of the anastomosing hemangioma are similar to those of a renal cell carcinoma on imaging, histology examination was necessary to confirm the diagnosis of anastomosing hemangioma and to prevent delay in listing for kidney transplantation. Good kidney function was achieved after transplantation, with no tumor recurrence.Conclusion: Our case underlines the importance for prompt surgical resection of an enhancing renal mass to confirm diagnosis in patients scheduled for kidney transplantation to avoid any delay. [ABSTRACT FROM AUTHOR]

Background: Nephrogenic diabetes insipidus (DI) secondary to a urinary tract obstruction is a rare condition. Herein, we report a case of partial nephrogenic DI due to obstructive uropathy in a patient with Castleman's disease.Case Presentation: A 78-year-old man underwent computed tomography (CT) at his local hospital because of persistent edema of the leg and polyuria (both lasting approximately 2 months); retroperitoneal fibrosis was detected on the CT scan. An abdominal CT scan showed bilateral hydronephrosis, and a surgical biopsy of the para-aortic lymph node revealed Castleman's disease. To resolve the hydronephrosis, a double J stent was inserted; however, his polyuria continued. As his serum osmolality (311 mOsm/kg) was greater than 300 mOsm/kg, and his serum sodium level was 149 mEq/L, a water deprivation test was not performed. On a vasopressin challenge test, his urine was not sufficiently concentrated to the expected range, indicating partial nephrogenic DI. He was treated with hydrochlorothiazide (25 mg/day), and his urine output gradually decreased to within the normal range. The patient recovered uneventfully and underwent treatment for Castleman's disease.Conclusion: To the best of our knowledge, this is the first case of partial nephrogenic DI due to obstructive uropathy associated with Castleman's disease. [ABSTRACT FROM AUTHOR]

The article presents a case study of a 69-year-old woman with polyuria and bilateral knee pain. The patient undergo abdominal computed tomography (CT) which reveals bilateral hydronephrosis. Magnetic resonance imaging shows diffuse irregular sclerotic changes involving the diaphysis and metaphysic. Immunohistochemistry discovered that biopsy samples were CD68(+), but S-100(-) and CD1a(-), which is a distinctive finding in Erdheim-Chester disease.