Publications by authors named "Sota Masuoka"
Article Synopsis
- * A case of parotid gland MALT lymphoma in a 49-year-old woman was challenging to diagnose due to unusual MRI findings attributed to amyloid deposits, which showed specific characteristics incompatible with typical malignant lymphoma imaging.
- * The patient underwent surgery, confirming MALT lymphoma with amyloid deposition, highlighting the importance of considering MALT lymphoma in patients with multiple salivary gland masses, especially when SjS is suspected and MRI results are atypical.
Purpose: To clarify the diagnostic utility and formation of the Mille-feuille sign for ovarian carcinosarcoma (OCS) on MRI, and to evaluate the other MRI findings and serum markers compared to ovarian metastases from colorectal carcinoma (OMCRC).
Method: Three blinded radiologists retrospectively reviewed MR images of 12 patients with OCS, 18 with OMCRC, and 40 with primary ovarian carcinoma (POC) identified by the electronic database of radiology reports. The interobserver agreement was analyzed using Fleiss' kappa test.
Purpose: Complete androgen insensitivity syndrome (CAIS) and Mayer-Rokitansky-Küster-Hauser syndrome (MRKHS) share common clinical features such as female phenotype, vaginal hypoplasia, and primary amenorrhea. Magnetic resonance imaging (MRI) is performed to investigate the cause of primary amenorrhea. However, the MRI features are also similar in both disorders.
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- The lymphatic system includes lymphoid organs and vessels, but findings related to intrarenal and perirenal lymphatic vessels are not well-documented in radiology.
- Lymphatic pathways in the renal cortex allow lymph to travel towards the hilum and capsular plexus, which can be visualized through contrast medium during CT urography, indicating possible complications like pyelolymphatic backflow.
- Conditions like congenital renal lymphangiectasia and acquired renal complications can affect imaging post-kidney transplant, with distinct fluid patterns in the urinary tract indicating issues like chyluria, highlighting the importance of understanding lymphatic pathways for effective cancer management.
Article Synopsis
- Hemochromatosis is a condition where excess iron builds up in the body, potentially causing damage to cells and organs, though central nervous system involvement is uncommon.
- This report details two cases of transfusion-induced hemochromatosis that affected the choroid plexus and pituitary gland, identified using MRI.
- MRI specifically using gradient echo sequences was effective in detecting low signal intensities indicating iron deposits in these brain regions, highlighting the need for MRI in suspected cases of iron overload to prevent potential organ damage.
The 2021 World Health Organization (WHO) classification system for thoracic tumors (including lung cancer) contains several updates to the 2015 edition. Revisions for lung cancer include a new grading system for invasive nonmucinous adenocarcinoma that better reflects prognosis, reorganization of squamous cell carcinomas and neuroendocrine neoplasms, and description of some new entities. Moreover, remarkable advancements in our knowledge of genetic mutations and targeted therapies have led to a much greater emphasis on genetic testing than that in 2015.
View Article and Find Full Text PDFPurpose: The incidence of immune checkpoint inhibitor (ICI)-induced liver injury has increased recently; however, its imaging characteristics remain unclear. This study aimed to characterize the computed tomography (CT) findings of ICI-induced liver injury.
Methods: This was a single-center retrospective study of patients with ICI-induced liver injury who underwent CT between January 2020 and December 2021.
Neck swelling due to lymph node (LN) metastasis is one of the initial symptoms of head and neck cancer, and in some cases, the primary tumor is not clinically evident. The purpose of imaging for LN metastasis from an unknown primary site is to identify the primary tumor or detect its absence, which leads to the correct diagnosis and optimal treatment. The authors discuss diagnostic imaging approaches for identifying the primary tumor in cases of unknown primary cervical LN metastases.
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- Cystitis cystica and glandularis is a condition affecting the bladder’s lining, often mimicking cancer due to its papillary or polyp-like masses.
- A pediatric case highlighted the use of dynamic contrast-enhanced MRI, which revealed a distinct "inchworm sign" that may help identify this condition.
- This "inchworm sign" could serve as a new diagnostic marker, aiding in the differentiation of cystitis cystica and glandularis from malignant tumors in clinical settings.
Article Synopsis
- The Cowper glands and ducts are usually undetectable on imaging, but abnormalities are becoming more common due to improved imaging techniques.
- This article reviews the anatomy of these glands and the imaging findings related to various conditions, including Cowper duct syringocele, Cowperitis, and Cowper stones.
- It highlights the diagnostic roles of retrograde urethrography and MRI, and mentions the rarity of Cowper gland carcinoma and hyperplasia, which can sometimes mimic cancer in imaging results.
Article Synopsis
- Epstein-Barr virus-positive mucocutaneous ulcer (EBVMCU) is a newly defined condition linked to immunodeficiency, recognized by the World Health Organization in 2017.
- A 72-year-old man taking methotrexate for rheumatoid arthritis presented with an ulcer that was initially suspicious for cancer, but imaging showed no lymphadenopathy.
- After stopping methotrexate, the ulcer healed, leading to a diagnosis of EBVMCU and highlighting the importance of considering this condition in immunocompromised patients with similar symptoms.
Article Synopsis
- Certain diseases in infants and children can increase the risk of bacterial meningitis (BM), necessitating awareness among radiologists for effective diagnosis and treatment.* -
- BM predisposition is classified into two main categories: infections that spread from nearby tissues to the cerebrospinal fluid (CSF) and immunodeficiencies, with specific imaging techniques recommended based on the presence of structural defects.* -
- The article emphasizes the importance of radiology in diagnosing and managing recurrent BM by recommending appropriate imaging methods, like CT and MR imaging, to identify underlying conditions and complications.*
Indocyanine green (ICG) excretory defect is characterized by an ICG retention rate of more than 50% at 15 min without any other abnormal liver functions. The incidence of ICG excretory defect is 0.007% in the Japanese population.
View Article and Find Full Text PDFObjectives: We aimed to identify dynamic CT features that can be used for prediction of local recurrence of hepatocellular carcinoma (HCC) after proton beam therapy (PBT).
Methods: We retrospectively retrieved CT scans of patients with PBT-treated HCC, taken between January 2004 and December 2016. 17 recurrent lesions and 34 non-recurrent lesions were retrieved.
Background: Sorafenib has been used in the treatment of advanced hepatocellular carcinoma (HCC) and renal cell carcinoma (RCC). Sorafenib-associated organ reduction have been reported on imaging, such as thyroid, pancreas and muscle, but there has been no research on prostate volume reduction (PVR).
Methods: We retrospectively analyzed 26 patients (twenty with HCC and six patients with RCC) who underwent sorafenib therapy for 31 to 1225 days (median, 100 days).