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Shigeki Onishi

Publications and source records attributed to Shigeki Onishi.

5 recordsLinked to original sources

[Solitary fibrous tumor of a kidney: a case report].

We report a case of solitary fibrous tumor (SFT) arising from a kidney. The patient was an 18-year-old female who visited our hospital with the complaint of left abdominal pain. Computed tomography revealed a slightly enhanced tumor of approximately 3 cm in diameter near the upper calyx of the left kidney. Renal cell carcinoma was suspected, and left nephrectomy was performed under laparoscopy. Histopathological examination revealed proliferation of CD34-positive spindle-shaped cells, and a diagnosis of SFT was made. There has been no local recurrence or distant metastasis for 15 months after the operation.

Adolescent↗

100-minute retroperitoneoscopic radical nephrectomy: a new retroperitoneal approach with a hand assisted method.

PURPOSE: A new approach for retroperitoneoscopic radical nephrectomy is introduced. The point of our surgical method is the application of a combination of hand assistance and pure laparoscopic procedures with appropriate surgical steps via the retroperitoneal approach. In our early series we had good surgical results and we completed radical nephrectomy in about 100 minutes using this procedure. MATERIALS AND METHODS: A total of 20 consecutive patients with renal cell carcinoma (cT1-2) who were operated on with this surgical method were analyzed. Surgical procedures occurred in 5 steps. In step 1 the retroperitoneal space was created manually from a pararectal incision at the umbilicus level. In step 2 the lateroconal fascia was incised and the renal hilar area was exposed with hand assistance. In step 3 hilar dissection was performed by pure laparoscopic procedure with another surgical instrument inserted from the hand device. Step 4 involved the application of hand assistance again for the quick mobilization of the kidney and adrenal gland. In step 5 the intact surgical specimen was retrieved from the hand device. RESULTS: Mean operative time and estimated blood loss were 103 +/- 21 minutes (range 70 to 145) and 49 +/- 85 ml (range 5 to 360), respectively. Mean days to oral intake and ambulation were 1.0 and 1.1, respectively. Operative times of the steps of hilar dissection and mobilization of the kidney and adrenal were shorter than in other series performed by standard retroperitoneoscopic radical nephrectomy. Major complications were not experienced. At this point, no metastasis has been experienced. CONCLUSIONS: Our surgical method may have the benefits of the retroperitoneal approach and hand assistance. The retroperitoneoscopic hand assisted method may be another important option in the 3 major approaches for laparoscopic radical nephrectomy, although longer-term followup is clearly required.

Adult↗

[Malacoplakia in the ureter and bladder].

We report a case of malacoplakia in the ureter and bladder. A 78-year-old woman was admitted to our department for detailed examination of hydronephrosis. A small-fingertip-sized tumorous yellowish white lesion was detected by cytoscopy at a site that appeared to be the right side of the ureteral orifice. Transurethral resection was performed on the same site. Flat yellowish white protruding lesions were seen at two sites on the right ureter. Michaelis-Gutmann bodies were observed in biopsy specimens from both the bladder and ureter, and a diagnosis of malacoplakia was made. Ascorbic acid and bethanechol chloride were administered postoperatively. Endoscopy performed three months after the operation showed that the protruding lesions in the bladder and ureter had disappeared. Narrowing of the ureter or vesicoureteral reflux has not been seen to date.

Aged↗

[Nephrogenic adenoma of the bladder treated with cystectomy to control severe irritative symptoms: a case report].

A 68-year-old man was admitted to our hospital for treatment of a recurrent bladder tumor. Histological examination performed after transurethral resection of the bladder tumor (TUR-BT) revealed a nephrogenic adenoma without any evidence of malignancy. After TUR-BT, total cystectomy was performed to control severe irritative symptoms. Prolonged cystitis and intravesical pirarubicin therapy after TUR-BT may have played an etiological role. Our case is the 25th case of nephrogenic adenoma of the bladder reported in the Japanese literature.

Adenoma↗

[Questionnaire survey on sexual behavior of Japanese males infected with sexually transmitted diseases].

In Japan, there has been a rapid increase in recent years in the incidence of sexually transmitted diseases (STD), particularly in teenagers and people in their twenties. To determine the factors causing this increase in STD, we carried out a questionnaire survey on the sexual behavior of Japanese males. The subjects were 248 male patients who were treated at our outpatient clinic. The results of the survey showed that 1) about 70% of the male patients were infected through sexual intercourse with partners who were not paid for such services; 2) the average number of partners in the past year was 5.8, and the average number of partners was highest for the teenage group and decreased with age; 3) only 29 (12.4%) of the 234 males used condoms; and 4) 192 (82.0%) of the 234 males received oral sex. The results of the survey suggest that a large "sexual network" has been formed among young Japanese people and that a large percentage of young Japanese people are engaged in unprotected sex.

Adolescent↗