[
    {
        "id": "osp-10732",
        "type": "article-journal",
        "title": "A Case of Pure Matrix Ureteral Stone: A rare type of urinary calculi that may be overlooked",
        "author": [
            {
                "family": "Elawdy",
                "given": "Mohamed M."
            },
            {
                "family": "El-Halwagy",
                "given": "Samer"
            },
            {
                "family": "Alsenani",
                "given": "Yasser A."
            },
            {
                "family": "R.",
                "given": "Abeer"
            },
            {
                "family": "Almazroui",
                "given": "Sultan"
            }
        ],
        "URL": "https://omanscience.com/en/articles/a-case-of-pure-matrix-ureteral-stone-a-rare-type-of-urinary-calculi-that-may-be-overlooked",
        "language": "en",
        "issued": {
            "date-parts": [
                [
                    2025
                ]
            ]
        },
        "container-title": "Sultan Qaboos University Medical Journal",
        "volume": "18",
        "issue": "4",
        "page": "e557-559",
        "DOI": "10.18295/squmj.2018.18.04.024",
        "publisher": "Sultan Qaboos University",
        "ISSN": "2075-051X",
        "abstract": "Matrix stones are a rare form of urinary calculi with a low mineral content. We report a 63-year-old female patient who presented to the Sohar Hospital, Sohar, Oman, in 2018 with unexplained left flank pain and constipation. She had a history of chronic renal failure (CRF) and had previously undergone haemodialysis (HD). Non-contrast computed tomography (CT) did not show any renal or urinary stones. However, a left-sided ureteroscopy revealed a yellow-coloured stone that was soft in consistency occupying the proximal 5 cm section of the ureter. Many attempts at forceps extraction were required for complete clearance. A global quantitative composition analysis revealed the extracted stone to be composed entirely of protein-matrix material. Matrix stones require a high index of suspicion as they are sometimes radiolucent and cannot be visualised on CT scans. Risk factors include being female and a history of urinary tract infections, CRF and HD."
    }
]