Biomedical subjects

Ryusuke Watanabe

Publications and source records attributed to Ryusuke Watanabe.

4 recordsLinked to original sources

PubMed2006

Obstruction of the ileal ureter by mesenteric vessels occurring 5 years after total ureteral substitution for bilateral ureteral stenosis due to systemic lupus erythematosus.

We previously reported a case of bilateral ureteral stenosis accompanied by systemic lupus erythematosus, which was successfully managed by total ureteral reconstruction using a segment of the ileum. Herein, we describe an unusual complication in the same patient, which we experienced 5 years after the ileal-ureteral substitution. Left-sided back pain repeated together with transient obstruction of the ileal ureter interposed between the right and left renal pelvis. Consequently, exploratory laparotomy revealed that left colic vessels oppressed and caused obstruction, and the obstructed ileal ureter was released by reconstitution of these vessels instead of re-anastomosis of the ileal ureter. Left hydronephrosis and related back pain disappeared postoperatively. The number of patients with an indication of ileal-ureteral substitution is increasing for various disorders, and thus, the present report gives additional suggestions for the follow up of patients with ileal ureter.

Adolescent↗

PubMed2006

Primitive neuroectodermal tumor of the adrenal gland.

We report a rare case of primitive neuroectodermal tumor arising from adrenal gland in adulthood, diagnosed preoperatively as having non-functional adrenocortical adenoma. Laparoscopic adrenalectomy was performed. Immunohistological examination revealed the definite diagnosis as primitive neuroectodermal tumor of the adrenal gland. Although primitive neuroectodermal tumor is a highly malignant neoplasm, there is no evidence of local recurrence and distant metastasis 16 months after surgery.

12E7 Antigen↗

PubMed2002

[Gasless laparoscopy-assisted live donor nephrectomy].

PURPOSE: We evaluated both efficacy and feasibility of laparoscopy-assisted live donor nephrectomy. MATERIALS AND METHODS: Since September 2000, 11 living kidney donors (2 males and 9 females) underwent laparoscopy-assisted live donor nephrectomy. All of sides were left. Gasless surgery was performed with a 7 cm pararectal upper abdominal incision and three trocars via a retroperitoneal approach. After creating the working space using balloon dissection technique, the abdominal wall was lifted using a metal retractor attached to the margin of the abdominal incision. Additionally, a metal plate, which was attached to the abdominal wall inside, was raised. The surgeon dissected left kidney from the skin incision under both direct vision and magnificated view on the monitor. RESULTS: The operating time, estimated blood loss and warm ischemic time were a mean of 209 minutes, 219 g, and 4.2 minutes, respectively. The mean times for the return to a normal diet and unassisted ambulation were 1.3 and 1.8 days, respectively. One case required blood transfusion due to subcutaneous hematoma at trocar entry site on the second day after surgery, in the remaining 10 cases there were no complications. All of donated kidneys achieved immediate function after engraftment. CONCLUSIONS: Gasless laparoscopy-assisted donor nephrectomy is recommended and advantageous for healthy kidney donors as a minimally invasive method.

Adult↗

PubMed2002

[Bilateral pheochromocytomas and asynchronous bilateral renal cell carcinomas associated with von Hippel-Lindau disease: a case report].

A 38-year-old man who had been followed with diagnosis of dilated cardiomyopathy and retinal angioma was referred to our hospital because of incidentally detected bilateral adrenal masses. Although he was normotensive, levels of catecholamine in urine were elevated and I131-MIBG scintigraphy showed accumulation in bilateral adrenal glands. Screening of central nervous system by MRI revealed cerebellar hemangioblastoma. Right adrenalectomy and left partial adrenalectomy were performed, both of which tumors pathologically diagnosed as pheochromocytoma, followed by resection of the cerebellar hemangioblastoma. Five months later, abdominal CT revealed a left renal tumor and underwent left partial nephrectomy, being diagnosed as renal cell carcinoma. A right renal tumor was detected on follow up CT at 1 year after the partial nephrectomy. Since cardiac function was deteriorated, we have followed with careful observation. This is the second documented case of bilateral renal cell carcinomas and bilateral pheochromocytomas with VHL in Japan.

Adrenal Gland Neoplasms↗