Masato Yanagi

ORCID: 0000-0003-3092-1014
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About
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Research Areas
  • Urological Disorders and Treatments
  • Urinary and Genital Oncology Studies
  • Bladder and Urothelial Cancer Treatments
  • Renal cell carcinoma treatment
  • Urologic and reproductive health conditions
  • Renal and related cancers
  • Ureteral procedures and complications
  • Abdominal Trauma and Injuries
  • Renal and Vascular Pathologies
  • Prostate Cancer Diagnosis and Treatment
  • Urinary Bladder and Prostate Research
  • Pediatric Urology and Nephrology Studies
  • Adrenal and Paraganglionic Tumors
  • Cancer Diagnosis and Treatment
  • Testicular diseases and treatments
  • Infectious Disease Case Reports and Treatments
  • Metastasis and carcinoma case studies
  • Muscle and Compartmental Disorders
  • Organ Donation and Transplantation
  • Cardiac tumors and thrombi
  • Amoebic Infections and Treatments
  • Kidney Stones and Urolithiasis Treatments
  • Inflammatory Myopathies and Dermatomyositis
  • Pelvic and Acetabular Injuries
  • Inflammatory Biomarkers in Disease Prognosis

Nippon Medical School Hospital
2020-2024

Nippon Medical School
2013-2024

Sapporo Hokuyu Hospital
2020-2023

Chiba Hokusou Hospital
2017-2019

Suzuki (Japan)
2018

Red Cross Hospital
2012

Japanese Red Cross Kanazawa Hospital
2011

We present the case of a rapidly growing inferior vena cava tumor thrombus in renal cell carcinoma.

10.1002/iju5.12709 article EN cc-by IJU Case Reports 2024-02-20

We report a case of retroperitoneal laparoscopic radical nephrectomy (LRN) in which the addition hand port was necessary and effective. A 52-year-old man with obesity (BMI 40.6 kg/m2) diagnosed 52-mm left renal cell carcinoma (cT1bN0M0). To avoid thick subcutaneous visceral fat abdomen, we selected LRN using approach four ports kidney position. During surgery, large amount flank pad perirenal prevented us from securing sufficient surgical field through traction retractor. pure procedure not...

10.2152/jmi.71.187 article EN The Journal of Medical Investigation 2024-01-01

We present a case involving pregnant woman who needed transurethral lithotripsy for ureteral stent removal because of the encrustation.

10.24546/0100490328 article EN PubMed 2024-07-01

Abstract Background Prolonged laparoscopic nephroureterectomy (LNU) for upper tract urothelial cancer (UTUC) can increase the frequency of intravesical recurrence after surgery. Therefore, it is important urological surgeons to have knowledge on preoperative risk factors prolonged LNU. However, few studies investigated We hypothesized that quantity perirenal fat affects pneumoretroperitoneum time (PRT) retroperitoneal LNU (rLNU). This study aimed investigate PRT during rLNU. Methods reviewed...

10.1186/s12894-024-01538-0 article EN cc-by BMC Urology 2024-07-29

To evaluate the efficacy of early transcatheter arterial embolization for hemodynamically stable patients with The American Association Surgery Trauma (AAST) grade 4 blunt renal trauma.The medical records consecutive trauma who were transported to our two critical care centers in Japan and treated (TAE) between 2001 2013 retrospectively reviewed. Treatment failure was defined as need further surgical intervention or re-embolization after initial embolization. We divided these cases into...

10.1272/jnms.jnms.2018_85-31 article EN Journal of Nippon Medical School 2018-08-15

High body mass index (BMI) and visceral obesity were reported to be associated with prolonged transperitoneal laparoscopic radical nephrectomy (LRN); however, factors that prolong retroperitoneal LRN remain unknown. We therefore investigated performed by non-expert surgeons.We defined non-experts surgeons as not certified perform surgery the Japanese Society of Endourology. retrospectively reviewed medical records 59 consecutive patients renal cell carcinoma treated at our hospital between...

10.1272/jnms.jnms.2021_88-302 article EN Journal of Nippon Medical School 2020-05-29

Robot-assisted laparoscopic prostatectomy (RALP) for prostate cancer was introduced in 2000 and rapidly gained popularity. The Da Vinci Surgical System? can ensure improved local control of fewer perioperative complications. However, RALP is performed the steep-Trendelenburg position (a combination lithotomy head-down tilt position/Lloyd-Davies position) to obtain a good surgical view, as result, well leg compartment syndrome (WLCS) become serious complication RALP. Here, we report case WLCS...

10.2152/jmi.69.145 article EN The Journal of Medical Investigation 2022-01-01

One of the major concerns patients with upper tract urothelial carcinoma (UTUC) treated nephroureterectomy is intravesical recurrence (IVR). The purpose present study was to investigate predictive risk factors for IVR after retroperitoneoscopic (RNU) UTUC.Clinicopathological and surgical information were collected from medical records 73 RNU non-metastatic UTUC, without a history or concomitant bladder cancer. association between clinicopathological surgery-related factors, including...

10.1186/s12894-021-00932-2 article EN cc-by BMC Urology 2021-12-01

Abstract Background To investigate the impact of Perirenal fat stranding (PRFS) on progression after radical nephroureterectomy (RNU) for renal pelvic urothelial carcinoma (RPUC) without hydronephrosis and to reveal pathological findings PRFS. Methods Clinicopathological data, including computed tomography (CT) ipsilateral PRFS, were collected from medical records 56 patients treated with RNU RPUC between 2011 2021 at our institution. PRFS CT was classified as either low or high The...

10.1007/s12672-023-00741-z article EN cc-by Discover Oncology 2023-07-03

The case presented is of a 47-year-old patient with an extravesical pedunculated bladder leiomyoma, which was difficult to distinguish from retroperitoneal tumor. Preoperatively, it suspected be tumor and laparotomy resection performed. lntraoperatively, the were connected by cord-like tissue. A retrospective review preoperative images revealed that tissue, identified intraoperatively, also present. Bladder leiomyomas can grow as tumors. Therefore, when continuity between only object,...

10.2152/jmi.70.513 article EN The Journal of Medical Investigation 2023-01-01

骨盤内悪性腫瘍に対する放射線照射に起因する放射線性出血性膀胱炎はしばしば難治性であり,これまでのところ決定的な治療法が確立されていないのが現状である.今回われわれは他の保存的治療が無効であった1例の放射線性出血性膀胱炎にプレドニゾロンの経口投与による止血を試み,良好な成績を得た.プレドニゾロン10mg/日を約7週間投与し投与量を漸減したが,投与から約2週間で肉眼的血尿が消失した.プレドニゾロン投与による副作用は認められなかった.以上の経験からプレドニゾロンの経口投与は高圧酸素治療や経尿道的電気凝固術を含む放射線性出血性膀胱炎の一般的な治療法が無効の場合に試みてよい治療法と思われた.

10.5980/jpnjurol.102.600 article JA The Japanese Journal of Urology 2011-01-01

Partial nephrectomy is now the gold standard treatment for small renal tumors. Local recurrence a major problem after partial nephrectomy, and local in remnant kidney common. A 77-year-old man underwent right T1 cell carcinoma. Microscopic examination revealed clear carcinoma, grade 2, stage pT3a. Although surgical margin was negative, carcinoma invaded perirenal fat, vascular involvement strongly positive. Thirty months an enhanced computed tomographic scan showed of extending into inferior...

10.1186/1756-0500-7-198 article EN cc-by BMC Research Notes 2014-03-29

(目的) 今回我々はTAEが深在性腎損傷に対し有用であるか,またその有用性が病院の規模で差があるか否かを検討した. (対象と方法) 2001年4月から2011年4月までの日本医科大学付属病院の腎損傷42例,2001年4月から2009年4月までの大田原赤十字病院の腎損傷33例を対象とした.腎損傷分類はCTと術中所見をもとに2008年の日本外傷学会分類に準じ,主に治療法について検討した. (結果) 日本医科大学付属病院42例は平均41.6歳,男性36例,女性6例,分類はI型16例,II型11例,III型15例であった.治療は保存的30例,TAE 7例,手術5例で,TAE・手術はIII型に対し行われた.42例中5例死亡したが腎損傷単独の死亡例はなかった.一方大田原赤十字病院33例は平均46.6歳,男性25例,女性8例,分類はI型9例,II型12例,III型12例であった.治療は保存的24例,TAE...

10.5980/jpnjurol.104.688 article EN The Japanese Journal of Urology 2013-01-01

Postoperative rhabdomyolysis is a rare but potentially fatal surgical complication. We experienced case of after laparoscopic radical nephrectomy (LRN). Right renal carcinoma was diagnosed in 31-year-old woman with body mass index 28.5 kg/m2. She underwent right retroperitoneal LRN the lateral decubitus position. The operating time approximately 5 hours. Immediately surgery, she reported pain left buttock, and reddish discoloration urine observed. On basis these symptoms, an elevated serum...

10.1272/jnms.jnms.2022_89-208 article EN Journal of Nippon Medical School 2022-08-25

Mucinous tubular and spindle cell carcinoma(MTSCC)が腎摘除術7年後にリンパ節転移をきたした症例を経験したので報告する.症例は87歳男性.右腎腫瘍を指摘され当科紹介受診した.CTにて6.5×6.0cmの右腎腫瘍を認め,右腎癌cT1bN0M0の診断にて腹腔鏡下右腎摘除術を施行した.当時の病理診断はPapillary renal carcinoma(type1)G2 pT1b...

10.5980/jpnjurol.108.30 article JA The Japanese Journal of Urology 2017-01-01

Abstract Background A history of preoperative obstructive pyelonephritis (OP) is a risk factor for febrile urinary tract infection (fUTI) after ureteroscopic lithotripsy (URSL). However, the impact OP treatment without drainage on post-URSL fUTI has not yet been studied. Therefore, this study aimed to investigate fUTI. Methods We retrospectively reviewed medical records 229 consecutive patients who underwent URSL at two institutions between September 2019 and August 2023. Risk factors were...

10.21203/rs.3.rs-3795238/v1 preprint EN cc-by Research Square (Research Square) 2024-01-03

A previous report has shown that cyclooxygenase-2 inhibitors can prevent the recurrence of cystitis glandularis postoperatively. Herein, we present a case in which tumor volume was markedly reduced by preoperative oral administration inhibitor.

10.1002/iju5.12728 article EN cc-by IJU Case Reports 2024-04-08

Introduction We encountered a case of urinary retention caused by urethral caruncle. Case presentation An 86‐year‐old woman presented to our hospital with retention. When the bladder catheter was placed, smooth, well‐defined mass 20 mm in diameter detected on posterior wall external meatus. The patient diagnosed due caruncle, and resected. pathologically compatible could urinate postoperatively. Ultrasound test after surgery showed residual urine volume 100 mL. Conclusion Inspecting meatus...

10.1002/iju5.12756 article EN cc-by IJU Case Reports 2024-07-06

Introduction We describe a case of an adrenal cavernous hemangioma that was surgically resected because tumor growth and intratumoral hemorrhage. Case presentation A 73‐year‐old woman presented with enlarged hemorrhage during the follow‐up incidental tumor. computed tomography showed left had grown from 23 to 44 mm over 1 year. Blood tests revealed normal metabolic profile. Paragangliomas metastatic tumors were suspected on imaging. Laparoscopic adrenalectomy performed prevent rupture due...

10.1002/iju5.12760 article EN cc-by IJU Case Reports 2024-07-09

We experienced a rare case in which iliopsoas abscess (IPA), caused by an Extended Spectrum β-Lactamase (ESBL)-producing Proteus mirabilis, perforated and communicated with the ureter sepsis. An 84-year-old woman, bedridden due to sequelae of cerebral hemorrhage, was brought our hospital chief complaint fever lasting for 3 weeks. Computed tomography (CT) revealed huge 180 × 110 100 mm IPA right muscle. The also found communicate muscle abscess, ureteral stenosis detected at same site,...

10.31662/jmaj.2023-0217 article EN JMA Journal 2024-01-01

This study aimed to investigate the preoperative risk factors for prolonged operating time in retroperitoneoscopic radical nephrectomy (RRN) renal cell carcinoma (RCC).

10.1272/jnms.jnms.2024_91-407 article EN Journal of Nippon Medical School 2024-08-25

今回我々は基礎疾患がなく尿道結石によるフルニエ壊疽による会陰部の膀胱直腸皮膚瘻に腹直筋皮弁を用いて形成術を行った1症例を経験した.患者は75歳男性,数日前に陰嚢の腫脹を認めたが放置し,意識障害が出現したため来院した.陰茎陰嚢は壊死しており,デブリードマン,抗菌薬の投与等で全身状態が改善したが膀胱直腸皮膚瘻を合併したため,腹直筋皮弁による再建を行った. フルニエ壊疽に膀胱直腸皮膚瘻を合併していた例は筆者が調べえた限りでは本邦初の報告である.またフルニエ壊疽の再建で皮弁を用いた例は本邦の報告では少なく,さらに皮弁の中でも腹直筋皮弁を用いた例も筆者が調べえた限りでは本邦初の報告である.また植皮術や皮弁形成術がどの位の割合で行われ,それにより早期退院の可能性を,本邦フルニエ壊疽120例について検討したが,今回の検討では退院が早まる事実はなかったが,欠損部の大きな症例では有用と思われた.

10.5980/jpnjurol.102.649 article JA The Japanese Journal of Urology 2011-01-01

Epididymal injuries without ipsilateral of the testicles are rare. We report a case solitary right epididymal injury complicated by left testicular rupture.

10.1002/ams2.919 article EN cc-by-nc Acute Medicine & Surgery 2023-12-31

高齢者,特に85歳以上の超高齢者は合併症や全身状態を考慮すると,薬物療法抵抗性の排尿障害に対する経尿道的前立腺切除術(TURP)は議論がある.よって今回われわれは薬物療法抵抗性の排尿障害を有する超高齢者に対するTURPの有効性と安全性について検討した.対象は8症例で,平均年齢90歳であった.全例腰椎麻酔下でTURPを施行.平均手術時間は61分,平均前立腺切除重量は25g,輸血症例は2症例であった.全例において術中,術後の合併症はなく,術後カテーテル抜去が可能となった.また平均観察期間37.6カ月においても全例でカテーテルは留置されていない.以上より麻酔可能である場合の超高齢患者において,投薬にてカテーテルが抜去できない場合は有効性と安全性の面からTURPは検討してよい治療法と思われた.

10.4030/jjcs.41.147 article JA Nihon Gekakei Rengo Gakkaishi (Journal of Japanese College of Surgeons) 2016-01-01
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