Keiko Sakamoto

Fukuoka University

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脳神経外科・救急病棟における入院患者が不快に感じる夜間の音の検討-第2報-

山梨大学看護学会誌 (2010)

Yoneyama Aemi Takano Miyuki Hiyoshi Yasunori Keiko Sakamoto Yamadera Yukari

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MR Diagnosis of Steroid Cell Tumor of the Ovary: Value of Chemical Shift Imaging

Magnetic Resonance in Medical Sciences (2009)

Keiko Sakamoto Ritsuko Fujimitsu Mikiko Ida S. Horiuchi Yoshihiro Hamada

A 53-year-old asymptomatic woman was found to have a pelvic mass at medical examination. Magnetic resonance (MR) imaging revealed a 4-cm solid mass at the right adnexal region, which showed marked hyperintensity on T2-weighted imaging and marked enhancement on post-contrast T1-weighted imaging. Chemical-shift imaging showed slight but significant signal loss on out-of-phase images, which suggested the presence of intratumoral lipid. The resected specimen exhibited typical features of steroid cell tumor, and Oil Red O stain was positive for cytoplasmic lipid.

Adnexal mass

10.2463/mrms.8.193

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Homogeneously enhancing breast lesions on contrast enhanced US: differential diagnosis by conventional and contrast enhanced US findings

Japanese Journal of Radiology (2016)

Ritsuko Fujimitsu Mikiko Shimakura Hiroshi Urakawa Ayako Morita Yoshinobu Shinagawa

Contrast Enhancement

10.1007/s11604-016-0549-z

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Obliteration of the Biliary System after Administration of an Oral Contrast Medium Is Probably due to Regurgitation: A Pitfall on MRCP

Magnetic Resonance in Medical Sciences (2015)

Keiko Sakamoto Yoshinobu Shinagawa Kimiyo Inoue Ayako Morita Hiroshi Urakawa

We retrospectively evaluated the incidence and related factors of obliteration of the lower bile duct after oral administration of contrast medium (OCM) probably resulting from its regurgitation into the biliary system (OCMRB) as observed on images of MR cholangiopancreatography (MRCP).We retrospectively analyzed 305 MRCP images in 278 patients obtained between February 2010 and March 2011 using negative OCM with 1.0- and 1.5-tesla clinical units. OCMRB was defined as positive when visualization of the common bile duct was clear on precontrast 2-dimensional (2D) MRCP but obliterated on postcontrast 3-dimensional (3D) MRCP. Two abdominal radiologists reviewed all images in consensus. The incidence of OCMRB was correlated to various clinicoradiological factors.We observed OCMRB on 11 MRCP images in 10 patients (3.6%). Among various clinicoradiological factors, the presence of juxtapapillary diverticula, pneumobilia, and history of intervention to the papilla were suggested as significant factors related to positive OCMRB with multivariate analysis (P < 0.05).OCMRB occurs in about 4% of the patients who undergo MRCP, typically in those with juxtapapillary diverticula, pneumobilia, and history of papillary intervention. Acquisition of MRCP images before OCM may secure visualization of the common bile duct in these patients.

Major duodenal papilla

Magnetic resonance cholangiopancreatography

10.2463/mrms.2015-0044

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Citations (4)

Hepatic Hodgkin lymphoma with delayed enhancement on CT and MRI

Radiology Case Reports (2016)

Yukie Higuma Ryo Yamauchi Ritsuko Fujimitsu Keiko Sakamoto Yoshinobu Shinagawa

Hepatic Hodgkin lymphoma is a rare disease, characterized by the presence of abundant granulofibrous stroma, and its radiological features have rarely been described. We report a 67-year-old man, who presented with liver masses that showed apparent delayed enhancement, along with systemic lymphadenopathy and musculoskeletal lesions. Repeated percutaneous needle biopsy, however, failed to confirm the diagnosis, and surgical biopsy finally revealed small amount of Hodgkin cells and Reed-Sternberg cells. In this report, the radiological features of hepatic Hodgkin lymphoma will be presented and discussed, in correlation with its histological findings.

10.1016/j.radcr.2016.11.013

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ECV Calculated from the Data Sets of the Equilibrium Phase of Dual-energy CT in Liver Fibrosis Assessment: Comparison with MRE

日本医学放射線学会総会抄録集 (2017)

Muto Emi Yoshinobu Shinagawa Keiko Sakamoto Morita Ayako Hiroshi Urakawa

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Importance of extracellular volume fraction of the spleen as a predictive biomarker for high-risk esophago-gastric varices in patients with chronic liver diseases: A preliminary report

European Journal of Radiology (2021)

Tomonobu Tani Keisuke Sato Keiko Sakamoto Emi Ito Marie Nishiyama

Splenic vein

Gastric varices

10.1016/j.ejrad.2021.109924

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Citations (9)

Undifferentiated carcinoma of the pancreas with osteoclast-like giant cells showing intraductal growth and intratumoral hemorrhage: MRI features

Radiology Case Reports (2019)

Keisuke Sato Hiroshi Urakawa Keiko Sakamoto Emi Ito Yoshihiro Hamada

We report a case of undifferentiated carcinoma of the pancreas with osteoclast-like giant cells ocalized within the main pancreatic duct (MPD). A 61-year-old woman was referred to our hospital for evaluation of dilatation of the MPD that was detected on screening sonogram. Preoperative MR imaging revealed a small hypervascular tumor within the dilated MPD, showing high signal on R2* map and signal reduction on in-phase as compared to out-of-phase. R2* hyperintensity and in-phase signal reduction may be a characteristic feature of undifferentiated carcinoma of the pancreas with osteoclast-like giant cells, which indicates intratumoral hemorrhage even if they are small.

10.1016/j.radcr.2019.07.020

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Citations (9)

A case of porphyria cutanea tarda of the liver exhibiting multifocal macrovesicular steatosis in the background of microvesicular steatosis, probably caused by uneven iron accumulation

Abdominal Radiology (2017)

Marie Nishiyama Keiko Sakamoto Yoshinobu Shinagawa Ayako Morita Hiroshi Urakawa

Porphyria cutanea tarda

Siderosis

Steatosis

10.1007/s00261-017-1056-0

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Citations (4)

Pseudolesion of the Liver on Gadoxetate Disodium-Enhanced MR Images Obtained After Transarterial Chemoembolization for Hepatocellular Carcinoma: Clinicoradiologic Correlation

American Journal of Roentgenology (2012)

Yoshinobu Shinagawa Keiko Sakamoto Ritsuko Fujimitsu Mikiko Shimakura Shinichi Kora

Pseudolesion of the Liver on Gadoxetate Disodium-Enhanced MR Images Obtained After Transarterial Chemoembolization for Hepatocellular Carcinoma: Clinicoradiologic CorrelationYoshinobu Shinagawa1, Keiko Sakamoto1, Ritsuko Fujimitsu1, Mikiko Shimakura1, Shin-ichi Kora1, Koichi Takano1 and Kengo Yoshimitsu1Audio Available | Share

Transarterial embolization

10.2214/ajr.11.8204

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Citations (15)