Morihiro Nishi

Publications (9)8.47 Total impact

• Article: Predictors of benign histology in clinical T1a renal cell carcinoma tumors undergoing partial nephrectomy.

  Tetsuo Fujita, Masatsugu Iwamura, Yoji Wakatabe, Morihiro Nishi, Daisuke Ishii, Kazumasa Matsumoto, Kazunari Yoshida, Shiro Baba
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  ABSTRACT: The anatomical characteristics of renal tumors have been classified using several systems. An association between tumor anatomical characteristics and postoperative histological diagnosis can be expected. The present study aimed to assess the rate of and predictive factors for benign histological findings for renal tumors diagnosed as T1a by preoperative imaging. From January 2000 through December 2010, 149 patients underwent partial nephrectomy (either open or laparoscopic) for T1a renal cell carcinoma. The frequency of benign histological findings was evaluated. Logistic regression analysis estimated the relative importance of predictive factors. The overall frequency of benign lesions was 8.1%. Multivariate analysis identified three statistically significant predictive factors for benign lesions: age, sex and exophytic tumor property (P = 0.0356, 0.0183 and 0.0330, respectively). The present findings suggest that exophytic tumors on preoperative imaging are more likely to be benign at histology after partial nephrectomy.
  International Journal of Urology 05/2013; · 1.75 Impact Factor
• Article: [A case of inverted urothelial carcinoma of bladder].

  Yoshiko Sugita, Wataru Ishikawa, Shoji Hirai, Norio Maru, Atsushi Sugita, Morihiro Nishi, Masatsugu Iwamura, Kazunari Yoshida
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  ABSTRACT: We present a case of inverted urothelial carcinoma of the bladder. A 60-year-old male was referred to our hospital for bilateral ureteral stones. When transurethral ureterolithotripsy was performed to treat these stones, a tumor at the trigone of bladder was incidentally diagnosed. This tumor was pedunculated and its surface was not uniformly round. After the operation, this tumor was diagnosed as inverted urothelial carcinoma through the histopathologic examination. The patient was subsequently followed up for 6 months and there was no evidence of recurrence. Although this is a rare case, it is worth considering there is an urothelial carcinoma with inverted proliferation.
  Hinyokika kiyo. Acta urologica Japonica 04/2013; 59(4):243-6.
• Article: Efficacy and late complications of laparoscopic pyeloplasty: Experience involving 125 consecutive ureters.

  Masatsugu Iwamura, Morihiro Nishi, Shigehiro Soh, Masaomi Ikeda, Kazumasa Matsumoto, Tetsuo Fujita, Shiro Baba
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  ABSTRACT: INTRODUCTION: Laparoscopic pyeloplasty is now widely recognized as a minimally invasive alternative for the surgical management of ureteropelvic junction obstruction. However, there have been insufficient reports describing the long-term outcomes and the stability of the results. In addition, late complications have not been thoroughly discussed. METHODS: Between October 1999 and December 2010, we performed laparoscopic pyeloplasty on 125 consecutive ureters in 119 patients with an obstruction of the ureteropelvic junction. We performed dismembered Anderson-Hynes pyeloplasty, Fenger plasty and Y-V flap in 108 (86.4%), 15 (12.0%), and 2 ureters (1.6%), respectively. RESULTS: All procedures were completed successfully. Median operative time was 200 min (range, 80-775 min) and median estimated blood loss was 20 mL (range, 20-250 mL). Intraoperative and postoperative complications categorized as Clavien grade II and III occurred in 11 (8.9%) procedures. Among them, three were observed after 12 months postoperative and all involved renal stones in the collapsed pelvis. In 120 (96%) ureters, hydronephrosis improved and/or obstructive pattern on diuretic renography disappeared during a median follow-up period of 45 months (range, 5-146 months). The degree of hydronephrosis steadily improved for more than 2 years, and re-obstruction was never observed after 1 year postoperative. CONCLUSION: The efficacy of laparoscopic pyeloplasty seems to be durable over 2 years postoperatively. Because obstruction recurrence was not observed after 12 months postoperative, patients with complete disappearance of hydronephrosis may unnecessarily be followed longer than 2 years. However, cases with persisting hydronephrosis should be regularly monitored because of the remaining possibility of stone formation.
  Asian Journal of Endoscopic Surgery 12/2012;
• Article: [Successful gemcitabine-nedaplatin therapy in a hemodialysis patient with ureteral carcinoma after bilateral nephroureterectomy].

  Yoshiko Sugita, Shoji Hirai, Wataru Ishkawa, Norio Maru, Takeshi Shimizu, Shinji Yokota, Morihiro Nishi, Masatsugu Iwamura, Shiro Baba
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  ABSTRACT: A 79-year-old male, who received hemodialysis due to bilateral nephroureterectomy and cysto-prostateurethrectomy. Five months later, an enlarged lymph node was found in the left of inguinal area. Abdominal computed tomography revealed a low density mass from the para-aortic lymph node to the left of inguinal area, suggesting lymph node metastasis of ureteral carcinoma. After 3 cycles of gemcitabinenedaplatin therapy, the size of lymph node metastasis decreased. This is a report of successful treatment of ureteral carcinoma with hemodialysis.
  Hinyokika kiyo. Acta urologica Japonica 03/2012; 58(3):159-63.
• Article: Angiolymphoid hyperplasia with eosinophilia on penile skin in a 7-year-old child.

  Morihiro Nishi, Kazumasa Matsumoto, Tetsuo Fujita, Takefumi Satoh, Keiichi Iwabuchi, Masatsugu Iwamura, Shiro Baba
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  ABSTRACT: We report a case of a 7-year-old child who presented with a painless mass on his penis. He underwent removal of the mass, which was found to be an angiolymphoid hyperplasia with eosinophilia. Angiolymphoid hyperplasia with eosinophilia is an extremely rare tumor, especially in children's penis. In this situation, treatment of this tumor should be considered carefully, and there is a chance of spontaneous regression after volume reduction surgery.
  Journal of Pediatric Surgery 03/2011; 46(3):559-61. · 1.45 Impact Factor
• Article: [Tick-bite in penile skin : a case report].

  Morihiro Nishi, Kazumasa Matsumoto, Masanori Sawamura, Ken Nakamura, Toshihiko Hayashi, Takefumi Satoh, Masatsugu Iwamura, Shiro Baba
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  ABSTRACT: A 42-year-old man who had no local or systemic symptoms presented with a yellowish tumor in the foreskin of his penis. He had travelled to Hokkaido to harvest insects, and recognized this tumor after returning home. Since it did not disappear after several days, he visited our hospital. The tumor was suspected to be due to an arthropod. En bloc resection including the arthropod was performed. Pathological findings demonstrated that the arthropod was Ixodes persulcatus. There were no symptoms after the surgery during the follow up. Ixodes persulcatus is a source of Lyme disease. Approximately ten patients develop Lyme disease per year, half of which are from Hokkaido in Japan. The case reported here was of a very rare tick-bite disease in the penis.
  Hinyokika kiyo. Acta urologica Japonica 03/2010; 56(3):185-7.
• Article: The role of the retrograde colonic enema in children with spina bifida: is it inferior to the antegrade continence enema?

  Daisuke Matsuno, Yuichiro Yamazaki, Yoshiyuki Shiroyanagi, Nobufumi Ueda, Mari Suzuki, Morihiro Nishi, Ayako Hagiwara, Terumi Ichiroku
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  ABSTRACT: The aim of this study was to evaluate the efficacy of the retrograde colonic enema relative to the Malone antegrade continence enema. We retrospectively investigated 25 children with spina bifida and fecal incontinence. Thirteen children had started retrograde colonic enema and twelve had started Malone antegrade continence enema. Fecal continence, water volume, time to washout, procedure frequency, pain during procedure, performance independence and demographical data were compared between the two groups. Fecal continence was achieved for 10 of 13 (76.9%) in the retrograde group and 9 of 12 (75.0%) in the antegrade group. In the antegrade group 8 of 12 (66.7%) performed procedure independently, while 3 of 13 (23.1%) did so in the retrograde group. Achievement of fecal continence did not differ between the groups, but procedure independence was significantly better in the antegrade group. Our results suggest that retrograde colonic enema was not inferior to Malone antegrade continence enema on fecal continence. We recommend considering retrograde colonic enema prior to introduction of Malone antegrade continence enema in children with spina bifida.
  Pediatric Surgery International 03/2010; 26(5):529-33. · 1.25 Impact Factor
• Article: Predicting early recurrent urinary tract infection in pretoilet trained children with vesicoureteral reflux.

  Yuichiro Yamazaki, Yoshiyuki Shiroyanagi, Daisuke Matsuno, Morihiro Nishi
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  ABSTRACT: We identified independent factors predicting recurrent urinary tract infection within 1 year after the first urinary tract infection in pretoilet trained children with vesicoureteral reflux. We retrospectively reviewed the records of infants younger than 2 years with primary vesicoureteral reflux and a history of febrile urinary tract infection. Patients were divided into 2 groups based on the presence or absence of recurrent febrile urinary tract infection. Analysis included age, gender, reflux laterality and grade, abnormalities on dimercapto-succinic acid renal scan and prophylactic antibiotic type. Univariate and multivariate analyses were performed to identify risk factors for recurrent febrile urinary tract infection. From 2004 to 2007, 78 children met study inclusion criteria. Mean age at the first urinary tract infection was 4 months (range 1 week to 16 months). None of the males were circumcised. Of 78 children 25 (32%) had a recurrent febrile urinary tract infection during 1 year of followup. Univariate analysis showed that bilateral reflux, high grade reflux (IV-V) and abnormal dimercapto-succinic acid scan were statistically significant predictors of early recurrent urinary tract infection (p <0.05). However, on multivariate analysis only an abnormal dimercapto-succinic acid scan showed a significant association with early recurrent urinary tract infection (OR 8.01, 95% CI 2.10-30.51, p = 0.002). Abnormal dimercapto-succinic acid renal scan is an important predictor of early recurrent urinary tract infection in pretoilet trained children with vesicoureteral reflux. Whether the explanation lies in congenital or infection related damage, in this patient subgroup careful clinical followup or early surgical management for reflux should be considered.
  The Journal of urology 08/2009; 182(4 Suppl):1699-702. · 4.02 Impact Factor
• Article: [Cranial nerve palsies due to skull base metastases in patients with prostate cancer: a report of two cases].

  Masaki Kimura, Takefumi Satoh, Tetsuo Fujita, Kazumasa Matsumoto, Morihiro Nishi, Masatsugu Iwamura, Masashi Kitano, Hiromichi Ishiyama, Kazushige Hayakawa, Shiro Baba
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  ABSTRACT: Two patients with prostate cancer showed cranial nerve palsies due to skull base metastases. Case 1: A 64-year-old man had prostate cancer (T4 N0 M1, Gleason score 7, prostate-specific antigen [PSA] level 372 ng/mL) with multiple bone metastases. Seventy-seven months after initiation of therapy, he had an articulation disorder and palsy of the left side of the tongue, with 12th cranial nerve palsy. Case 2: A 75-year-old man had a prostate cancer (T3b N0 M1, Gleason score 7, PSA level 177 ng/mL) with multiple bone metastases. Sixty-six months after initiation of therapy, he had hearing loss, noise in the right ear, and dizziness, with 8th cranial nerve deficits. Magnetic resonance imaging showed low intensity in the clivus in both cases, and all over the skull in case 2. The first patient was treated with radiation therapy and intravenous steroids at an early date. His symptoms improved.
  Nippon Hinyōkika Gakkai zasshi. The japanese journal of urology 08/2006; 97(5):748-51.