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167 results on '"Hamamoto, Kohei"'

12. Idiopathic myointimal hyperplasia of mesenteric veins: radiological evaluation using CT angiography

Author

Morimura, Fumio, primary, Edo, Hiromi, additional, Niwa, Takafumi, additional, Sugiura, Hiroaki, additional, Suyama, Yohsuke, additional, Okazaki, Soya, additional, Narimatsu, Kazuyuki, additional, Ohno, Hiroki, additional, Okamoto, Koichi, additional, Ueno, Hideki, additional, Yoshimatsu, Shinya, additional, Miyai, Kosuke, additional, Hamamoto, Kohei, additional, and Shinmoto, Hiroshi, additional

Published
2023
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15. Double inversion recovery MRI of subcortical band heterotopia and its variations.

Author

Chiba, Emiko, Sato, Noriko, Kimura, Yukio, Shigemoto, Yoko, Maki, Hiroyuki, Arizono, Elly, Hamamoto, Kohei, Taniguchi, Go, Iwasaki, Masaki, Ota, Miho, Matsuda, Hiroshi, and Nakagawa, Eiji

Subjects
MAGNETIC resonance imaging, WHITE matter (Nerve tissue)
Abstract

Background and Purpose: Subcortical band heterotopia (SBH) is a malformation of cortical development diagnosed via MRI. Currently, patients with SBH are classified according to Di Donato's classification. We aimed to show a variation of SBH and the usefulness of double inversion recovery (DIR) images. Methods: We retrospectively reviewed the MRI findings of 28 patients with SBH. The patients were classified according to Donato's classification by using conventional MR images, and their DIR findings were reviewed. Results: Of 28 patients, 20 were grade 1 and 8 were grade 2 according to Di Donato's classification. In 15 of 28 patients, the following four types of atypical MRI findings were detected: asymmetry distribution (four cases), coexistence of thin and thick SBH (five cases), and DIR faint abnormal signal intensity in subcortical white matter (five cases) and in deep white matter (five cases). The latter two types were detected on DIR alone and have not been reported. Additionally, these were identified only in the mild group (Di Donato's classification 1‐1 or 1‐2). Conclusion: DIR is a useful MRI sequence for detecting faint white matter signal abnormalities, and it can aid in the accurate classification of SBH and identification of its variations, which may reflect the pathology of SBH. [ABSTRACT FROM AUTHOR]

Published
2023
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23. Recurrent bicycle falls by an elderly man who developed multiple intramuscular abscesses associated with urine leakage secondary to posterior urethral injury caused by pelvic ring disruption.

Author

Matsumoto, Yoko, Tanno, Keisuke, Nakamura, Yuhei, Hamamoto, Kohei, Yoshihara, Hanako, Fukuchi, Takahiko, Oyama‐Manabe, Noriko, and Sugawara, Hitoshi

Subjects
OLDER men, PELVIS, CYCLING, PELVIC fractures, BICYCLES, PELVIC floor, URETHRA
Abstract

Key Clinical Message: With the aging of the population, physicians need to pay more attention to assessing the presence or absence of pelvic fractures and urinary retention associated with urethral injury due to such fractures in the elderly when falling from bicycles. Walking ability does not rule out the presence of pelvic fractures. Many geriatric patients are likely to fall off bicycles. Physicians should pay more attention when assessing complications related to urethral trauma caused by pelvic fractures in the elderly after falling from bicycles. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Diagnostic imaging and histopathologic features of rounded atelectasis in four cats and one dog: A descriptive case series study.

Author

Fukuda, Shoko, Reetz, Jennifer A., Hamamoto, Kohei, Griffin, Lynn, and Schaffer, Paula A.

Abstract

In humans, rounded atelectasis is defined as focal lung collapse that radiologically appears as a round mass‐like lesion in the periphery of the lung. In general, human patients with rounded atelectasis have a history of pleural effusion and abnormal pleura and characteristic CT findings help to distinguish rounded atelectasis from pulmonary neoplasia without the need for invasive surgical biopsy. This retrospective multi‐center case series describes rounded atelectasis in four cats and one dog. Chylothorax was seen in four patients and an eosinophilic and lymphoplasmacytic effusion was seen in one patient. All patients had solitary or multifocal subpleural pulmonary masses (26 masses total in 5 patients) with diffuse, multifocal, or focal visceral and parietal pleural thickening. All the masses but one were broad‐based towards the visceral pleura. Masses were most common in the ventral or lateral aspect of the lungs. Indistinctness at the hilar aspect of the lesion was seen in all masses; a "comet tail" sign was seen in 14 of 26 masses. On postcontrast images, the lesions were homogeneously enhanced in 24 of 26 masses and heterogeneous in two of 26 masses. Other findings include ground glass opacities (n = 5), parenchymal bands (n = 4), mild to moderate lymphadenopathy (n = 4), and compensatory hyperinflation of the lung lobes not affected by atelectasis (n = 2). Histopathology of four cases revealed atelectasis with fixed pleural folds, chronic pleuritis, and mild to moderate pleural fibrosis. Awareness of rounded atelectasis in veterinary species will enable inclusion of a benign etiology into the differential diagnosis for subpleural masses in cases with pleural abnormalities. [ABSTRACT FROM AUTHOR]

Published
2023
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27. Dose-volume Histogram-based Predictors for Hematuria and Rectal Hemorrhage in Patients Receiving Radiotherapy After Radical Prostatectomy

Author

Shirai, Katsuyuki, Suzuki, Masato, Akahane, Keiko, Takahashi, Yuta, Kawahara, Masahiro, Yamada, Erika, Wakatsuki, Masaru, Ogawa, Kazunari, Takahashi, Satrou, Minato, Kyosuke, Hamamoto, Kohei, Saito, Kimitoshi, Oshima, Masashi, Konishi, Tsuzumi, Nakamura, Yuhki, Washino, Satoshi, and Miyagawa, Tomoaki

Subjects
urologic and male genital diseases
Abstract

The aim of this study was to evaluate the dose-volume histogram parameters for late hematuria and rectal hemorrhage in patients receiving radiotherapy after radical prostatectomy.

Published
2020

30. Treatment of Massive Hemoptysis After Thoracic Aortic Aneurysm Repair

Author

Morimura, Fumio, primary, Hamamoto, Kohei, additional, Edo, Hiromi, additional, Ishida, Osamu, additional, Tsustsumi, Koji, additional, Tamada, Soichiro, additional, Kuwamura, Hiroshi, additional, Enjoji, Yasuhiro, additional, Suyama, Yohsuke, additional, Sugiura, Hiroaki, additional, Watanabe, Sadahiro, additional, Ozaki, Ippei, additional, and Shinmoto, Hiroshi, additional

Published
2022
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38. 縦隔内海綿状血管腫の１例 ：画像所見を中心に

Author

Okochi, Tomohisa, Tanno, Keisuke, Chiba, Emiko, Hamamoto, Kohei, Minato, Kyosuke, Tanaka, Osamu, Tsubochi, Hiroyuki, and Endo, Shunsuke

Subjects
海綿状血管腫, contrastenhanced dynamic MRI, ダイナミックMRI, mediastinal tumor, 縦隔腫瘍, ダイナミックCT, cavernous hemangioma, contrast-enhanced dynamic CT
Abstract

A 50-year-old female was admitted to Jichi Medical University Saitama Medical Center with a mediastinal tumor suspected on thoracic computed tomography (CT). The CT showed a well-demarcated, nodular lesion in the left anterior mediastinum, which was adjacent to the aortic arch. A contrast-enhanced dynamic CT study revealed spotty enhancement in the peripheral part of the tumor in the arterial phase; subsequently, the contrast effect progressively spread throughout the tumor in the delayed phase.On magnetic resonance imaging (MRI), the tumor had a homogeneously hyperintense signal on T2-weighted image. Diffusion-weighted image demonstrated high intensity in the tumor with a high apparent diffusion coefficient. A neurogenic tumor was suspected, and surgery was performed without a definitive preoperative diagnosis. The tumor was removed and was histologically diagnosed as a cavernous hemangioma.Here, we report the multimodality imaging findings of a patient with a cavernous hemangioma in the mediastinum. When a cavernous hemangioma is on the differential diagnosis of a mediastinal tumor, dynamic CT or MRI studies should be considered to facilitate making a preoperative diagnosis.

Published
2018

40. Combining the Tumor Contact Length and Apparent Diffusion Coefficient Better Predicts Extraprostatic Extension of Prostate Cancer with Capsular Abutment: A 3 Tesla MR Imaging Study

Author

Ito, Koichi, primary, Chiba, Emiko, additional, Oyama-Manabe, Noriko, additional, Washino, Satoshi, additional, Manabe, Osamu, additional, Miyagawa, Tomoaki, additional, Hamamoto, Kohei, additional, Hiruta, Masahiro, additional, Tanno, Keisuke, additional, and Shinmoto, Hiroshi, additional

Published
2021
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42. Severe esophageal stenosis in a patient with metastatic colon cancer following palliative radiotherapy, ramucirumab, and chemotherapy

Author

Akahane, Keiko, primary, Shirai, Katsuyuki, additional, Wakatsuki, Masaru, additional, Ogawa, Kazunari, additional, Minato, Kyosuke, additional, Hamamoto, Kohei, additional, Takahashi, Satoru, additional, Suzuki, Koichi, additional, Takahashi, Jun, additional, Rikiyama, Toshiki, additional, Matsumoto, Keita, additional, and Mashima, Hirosato, additional

Published
2020
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45. Imaging Features of Uncommon Entities That Manifest with Torsion

Author

Nakamata, Akihiro, Matsuki, Mitsuru, Watanabe, Yuriko, Kobayashi, Ryoma, Fujii, Nana, Kunitomo, Naoki, Otake, Yuko, Fujii, Hiroyuki, Hamamoto, Kohei, and Mori, Harushi

Abstract

Various structures in the body can undergo torsion, which requires emergent diagnosis to facilitate early surgical intervention to restore blood flow, and familiarity with the various imaging findings of torsion can aid in timely management.

Published
2024
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46. Rupture of Hepatic Pseudoaneurysm Formed Nine Years after Carbon Ion Radiotherapy for Hepatocellular Carcinoma

Author

Yoshikawa, Shuhei, primary, Asano, Takeharu, additional, Watanabe, Mizuki, additional, Ishii, Takehiro, additional, Ohtake, Haruka, additional, Fujiwara, Junichi, additional, Sekine, Masanari, additional, Uehara, Takeshi, additional, Hamamoto, Kohei, additional, Yuhashi, Kazuhito, additional, Matsumoto, Satohiro, additional, Asabe, Shinichi, additional, Miyatani, Hiroyuki, additional, Matsuura, Katsuhiko, additional, and Mashima, Hirosato, additional

Published
2019
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