{
  "abstract": "Background Coronary artery anomalies are uncommon but clinically important. CT coronary angiography (CTCA) provides 3D delineation of origin and course. Large series report ~1-2% anomaly prevalence on coronary angiography. We assessed incidence and spectrum of coronary anomalies in a HHFT three-hospital CTCA programme (2020-2025).Aim To determine the incidence and spectrum of coronary artery anomalies detected on CTCA across a multi-centre NHS cardiac CT programme, and to evaluate temporal variation in the context of evolving scanner technology and service expansion.Methods Retrospective single-operator CTCA log review. Anomalies were categorised by type. Incidence per year was calculated with exact 95% confidence intervals. Trends over years were tested by Cochran-Armitage and by grouped-binomial logistic regression. Late vs early (2024-25 vs 2020-23) comparison used Fisher’s exact test. Platform for each anomaly case was recorded.Results 18 anomalies were found in 1,514 scans (1.19%, 95% CI 0.71-1.87). LCX variants were 50% of cases. Yearly rates (1.53%, 0.49%, 0.36%, 0.43%, 2.89%, 1.41%) mirrored published 1-2% ranges. Neither trend test was significant (Z≈1.39, p≈0.16; OR≈1.24/y, p≈0.17). The 2024-25 period showed a higher proportion (RR≈3.30) but this aligns with increased scanning and new scanners (tables 1 and 2, figure 1).Discussion Our findings (~1%) agree with literature. LCX variants were most common. No statistically significant temporal trend was observed. The higher 2024 rate likely reflect programme growth and scanner upgrades (new Canon Prime/Prism systems) rather than true prevalence change; improved detector technology and experience could increase anomaly detection. Small case numbers and aggregated annual data limit statistical power. Which anomaly category was most frequent?A) Malignant coursesB) RCA variantsC) LCX variantsD) LAD variantsE) Other (complex)Abstract 19 Table 2Anomaly categoriesCategory Count (%) Examples LCX variants 9 50.0% Aberrant LCX origin; LCX arising from RCA RCA variants 5 27.8% Aberrant RCA; double RCA; intra-atrial RCA Malignant courses 2 11.1% Malignant RCA course (inter-arterial) Other/complex 2 11.1% Separate LAD/LCX ostia; anomalous right cusp Abstract 19 Table 1CTCA coronary anomaly incidence by year. Small counts yield wide exact CisYear Number of coronary abnormalities CTCA scans number Incidence (%) 95% CI (%) 2020 2 131 1.53% 0.19–5.41 2021 1 205 0.49% 0.01–2.69 2022 1 280 0.36% 0.01–1.97 2023 1 231 0.43% 0.01–2.39 2024 7 242 2.89% 1.17–5.84 2025 6 425 1.41% 0.53–3.07 Total 18 1,514 1.19% 0.71–1.87 Abstract 19 Figure 1Annual coronary anomaly incidence. No clear upward trend is seen(Answer: C (LCX variants, 9 of 18 cases))",
  "authors": [
    {
      "affiliations": [
        "HHFT"
      ],
      "name": "Yousri Waziri"
    },
    {
      "affiliations": [
        "HHFT"
      ],
      "name": "Talha Sadiq"
    },
    {
      "affiliations": [
        "HHFT"
      ],
      "name": "Peter Chapman"
    }
  ],
  "title": "19 Incidence and spectrum of coronary artery anomalies detected on cardiac CT across a three-hospital HHFT programme, 2020–2025",
  "uid": "1c9cc927-96fe-57df-abb4-41d5df6a95a1"
}