{
  "abstract": "Background The purpose of this study was to clarify the usefulness of the ‘hot cross bun’ sign (HCBS) as a diagnostic imaging marker in a large cohort of patients with multiple system atrophy (MSA) and spinocerebellar ataxia (SCA).Methods This multicentre study included 97 patients with neuropathologically confirmed MSA, and 105 patients with genetically confirmed SCA. Neuroimaging features, including HCBS and middle cerebellar peduncle (MCP) hyperintensities, were assessed. HCBS was graded from 0 to 2: 0, none; 1, only a vertical hyperintense line; and 2, a cruciform hyperintense line. The neuropathological correlates of HCBS were evaluated in 15 patients with MSA with ≤3 months between MRI and autopsy.Results In patients with a disease duration <3 years, grade 1 or 2 HCBS was detected in 100% patients with MSA with predominant cerebellar ataxia (MSA-C) and 39.0% with SCA; whereas grade 2 HCBS was observed in 50% with MSA-C and 2.4% with SCA. Moreover, the coexistence of grade 2 HCBS and MCP hyperintensities exhibited a specificity of 100%. A neuropathological assessment revealed myelin loss, alpha-synuclein aggregates and astrocytic reaction in the MCP, transverse fibres, central zone between longitudinal fasciculi and raphe nucleus, with relative preservation in the longitudinal fasciculi and medial lemniscus in patients with MSA and grade 2 HCBS.Conclusions Grade 1 or 2 HCBS is a highly sensitive finding in patients with MSA-C, and the observation of grade 2 HCBS within 3 years of motor symptom onset has excellent specificity for discriminating MSA-C from SCA, especially when accompanied by MCP hyperintensities.",
  "authors": [
    {
      "affiliations": [
        "Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan"
      ],
      "name": "Atsuhiko Sugiyama"
    },
    {
      "affiliations": [
        "Neuropathology, Aichi Medical University, Nagakute, Japan"
      ],
      "name": "Yuichi Riku"
    },
    {
      "affiliations": [
        "Neuroscience, Mayo Clinic Jacksonville Campus, Jacksonville, Florida, USA"
      ],
      "name": "Shunsuke Koga"
    },
    {
      "affiliations": [
        "Diagnostic Radiology and Radiation Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan"
      ],
      "name": "Hajime Yokota"
    },
    {
      "affiliations": [
        "Radiology, Chiba University Hospital, Chiba, Japan"
      ],
      "name": "Hiroki Mukai"
    },
    {
      "affiliations": [
        "Laboratory Medicine, National Center of Neurology and Psychiatry, Kodaira, Japan"
      ],
      "name": "Masaki Takao"
    },
    {
      "affiliations": [
        "Neurology, Tokyo Metropolitan Neurological Hospital, Tokyo, Japan"
      ],
      "name": "Kentaro Hayashi"
    },
    {
      "affiliations": [
        "Neurology, National Hospital Organization Chibahigashi National Hospital, Chiba, Japan"
      ],
      "name": "Takahiro Takeda"
    },
    {
      "affiliations": [
        "Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan"
      ],
      "name": "Shigeki Hirano"
    },
    {
      "affiliations": [
        "Neuropathology, Aichi Medical University, Nagakute, Japan"
      ],
      "name": "Mari Yoshida"
    },
    {
      "affiliations": [
        "Neuropathology, Aichi Medical University, Nagakute, Japan"
      ],
      "name": "Yasushi Iwasaki"
    },
    {
      "affiliations": [
        "Neurology, Japanese Red Cross Aichi Medical Center Nagoya Second Hospital, Nagoya, Japan"
      ],
      "name": "Keizo Yasui"
    },
    {
      "affiliations": [
        "Neurology, Japanese Red Cross Aichi Medical Center Nagoya Daiichi Hospital, Nagoya, Japan"
      ],
      "name": "Takashi Ando"
    },
    {
      "affiliations": [
        "Neurology, Toyota Memorial Hospital, Toyota, Japan"
      ],
      "name": "Yasuhiro Ito"
    },
    {
      "affiliations": [
        "Neurology, Ichinomiya Municipal Hospital, Aichi, Japan"
      ],
      "name": "Takuya Tamura"
    },
    {
      "affiliations": [
        "Neuroscience, Mayo Clinic Jacksonville Campus, Jacksonville, Florida, USA"
      ],
      "name": "Hiroaki Sekiya"
    },
    {
      "affiliations": [
        "Neuroscience, Mayo Clinic Jacksonville Campus, Jacksonville, Florida, USA"
      ],
      "name": "Dennis W Dickson"
    },
    {
      "affiliations": [
        "Radiology, Mayo Clinic Jacksonville Campus, Jacksonville, Florida, USA"
      ],
      "name": "Erik H Middlebrooks"
    },
    {
      "affiliations": [
        "Neurology, National Center of Neurology and Psychiatry, Kodaira, Japan"
      ],
      "name": "Yuji Takahashi"
    },
    {
      "affiliations": [
        "Radiology, National Center of Neurology and Psychiatry, Kodaira, Japan"
      ],
      "name": "Noriko Sato"
    },
    {
      "affiliations": [
        "Laboratory Medicine, National Center of Neurology and Psychiatry, Kodaira, Japan"
      ],
      "name": "Masashi Mizutani"
    },
    {
      "affiliations": [
        "Laboratory Medicine, National Center of Neurology and Psychiatry, Kodaira, Japan"
      ],
      "name": "Terunori Sano"
    },
    {
      "affiliations": [
        "Neurology, Mihara Memorial Hospital, Isesaki, Japan"
      ],
      "name": "Ban Mihara"
    },
    {
      "affiliations": [
        "Laboratory Medicine and Pathology (Neuropathology), Tokyo Metropolitan Neurological Hospital, Tokyo, Japan"
      ],
      "name": "Takashi Komori"
    },
    {
      "affiliations": [
        "Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan"
      ],
      "name": "Satoshi Kuwabara"
    }
  ],
  "title": "Revisiting ‘hot cross bun’ sign: a multicentre MRI study of 97 patients with autopsy-confirmed multiple system atrophy",
  "uid": "9cf3a7e3-9951-5e0a-a12c-403da8ddd1ec"
}