To assess the size and number of pulmonary lesions in patients with hepatoblastoma Diagnostic criteria of the PRETEXT (Pretreatment Extent of Disease) staging system for hepatoblastoma states that pulmonary lesions are judged to be metastases if there is one nodule greater than 10mm in diameter, or if among several nodules at least one is greater than 5mm in diameter. Read More

Meeting name: SPR 2017 Annual Meeting & Categorical Course , 2017

Authors: Miyazaki Osamu, Oguma Eiji, Nishikawa Masanori, Tanami Yutaka, Kitami Masahiro, Hosokawa Takahiro

Keywords: hepatoblastoma, lung metastasis, chest CT

MRI is the gold standard for the diagnosis of acute septic sacroiliitis. However, appropriate timing of the procedure has not been addressed in the literature. MRI is highly sensitive for detecting long tubular bone osteomyelitis as early as 24-48 hours of symptom onset. The hypothesis of this study is that the onset of bone marrow edema of acute hematogenous osteomyelitis (AHO) of pelvis might be delayed as compared with long bone. The purpose of this study is to evaluate the optimum timing of MRI examination from the onset of disease. Read More

Meeting name: SPR 2018 Annual Meeting & Postgraduate Course , 2018

Authors: Miyazaki Osamu, Aoki Hidekazu, Miyasaka Mikiko, Okamoto Reiko, Tsutsumi Yoshiyuki, Nosaka Shunsuke

Keywords: scroiliitis, osteomyelitis, MRI

Fetal CT has almost the same utility as a postnatal skeletal survey. Despite this benefit, the associated radiation exposure is disadvantageous and radiation dose reduction is mandatory. It is however impossible to measure the actual radiation dose to the fetus directly. Several previous reports have described the CT dose index (CTDI) volume and dose length product (DLP) as representing an imagined fetal dose. The actual fetal radiation dose needs to be confirmed using a phantom that practically corresponds to a pregnant woman. Read More

Meeting name: SPR 2019 Annual Meeting & Postgraduate Course , 2019

Authors: Miyazaki Osamu, Sawai Hideaki, Yamada Takahiro, Murotsuki Jun, Horiuchi Tetsuya, Nishimura Gen

Keywords: skeletal dysplasia, fetal CT, radiation dose

The objective of this study was to evaluate the benefits of thin-slab maximum intensity projection (MIP) images for the detection of lung nodules in pediatric chest CT. Read More

Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020

Authors: Saito Yuki, Miyazaki Osamu, Onishi Saki, Irahara Saho, Okamato Reiko, Miyasaka Mikiko, Tsutsumi Yoshiyuki, Nosaka Shunsuke, Matsumoto Kimikazu

Keywords: maximum intensity projection, lung nodule, CT

To assess the level of the conus medullaris using spinal ultrasonography, bony landmarks such as the lowest ribs, the most caudal ossification center (MCOC) of the vertebral body, and angulation in the lumbosacral region are used. However, determining the level of the conus medullaris is sometimes difficult because of the variations of these landmarks. Purpose of this study was to analyze the variation of these landmarks. However, it is difficult to evaluate these variations using ultrasonography, because this method allows a narrow field of view. To supplement this limitation, we tried to evaluate these landmarks retrospectively using (1) whole spine CT or (2) lumbosacral CT in combination with chest radiography. Read More

Meeting name: IPR 2016 Conjoint Meeting & Exhibition , 2016

Authors: Tsutsumi Yoshiyuki, Okamoto Reiko, Miyasaka Mikiko, Miyazaki Osamu, Ishii Masaya, Muto Ayako, Okada Haruka, Hara Hiroko, Nosaka Shunsuke

Keywords: spine, CT, ultrasound, variation

Esophageal atresia (EA) is a relatively rare congenital anomaly. Esophageal pouch (EP) is the only direct sign of EA on fetal MRI, but is not always seen. Distended hypopharynx (DHP) has been reported as a useful prenatal sign of EA, but as EP and DHP are both subjective assessments, the prenatal diagnosis of EA is challenging. The aim of this study was to evaluate whether quantitative measurement of distended pharynx is useful in the diagnosis of EA. Read More

Meeting name: SPR 2023 Annual Meeting & Postgraduate Course , 2023

Authors: Michishita Yukiko, Miyazaki Osamu, Imai Ayako, Okamato Reiko, Tsutsumi Yoshiyuki, Miyasaka Mikiko, Sago Haruhiko, Kanamori Yutaka, Nosaka Shunsuke

Keywords: Esophageal Atresia, fetal MRI, Quantitative

Congenital high airway obstruction syndrome (CHAOS) is a rare life-threatening disease and prenatal diagnosis is essential. Some characteristic features seen on fetal MRI are well-known: primary lesion (upper airway obstruction) and secondary changes (dilated trachea, flattened/inverted diaphragm, enlarged and hyperintense lung). It is also reported that these secondary changes may be reduced if tracheoesophageal fistula (TEF) is present. The aim of this study is to evaluate the accuracy of fetal MRI in the prenatal diagnosis of CHAOS by comparing results with those of normal fetuses. Read More

Meeting name: SPR 2019 Annual Meeting & Postgraduate Course , 2019

Authors: Aoki Hidekazu, Nosaka Shunsuke, Miyazaki Osamu, Irahara Saho, Okamato Reiko, Tsutsumi Yoshiyuki, Miyasaka Mikiko, Sago Haruhiko, Kanamori Yutaka, Suzuki Yasuyuki

Keywords: CHAOS, fetus, MRI

Congenital diaphragmatic hernia (CDH) is the result of incomplete closure of the normal pleuroperitoneal canal. CDH is usually detected prenatally or present in the newborn period with severe respiratory distress. In contrast, delayed presentation of CDH (D-CDH), defined as CDH diagnosed at later than 30 days of age, is known as rare subset of CDH. The outcome of patients with D-CDH is generally favorable, but misdiagnosis can result in morbidity and mortality. This educational exhibit will demonstrate clinico-radiological characteristics of D-CDH. Read More

Meeting name: SPR 2017 Annual Meeting & Categorical Course , 2017

Authors: Nosaka Shunsuke, Fujino Akihiro, Kanamori Yutaka, Niiya Noriko, Okamoto Reiko, Miyazaki Osamu, Muto Ayako, Miyasaka Mikiko, Tsutsumi Yoshiyuki, Aoki Hidekazu, Uematsu Satoko

Keywords: Delayed presentation, Congenital diaphrargmatic hernia