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Updated: Feb 14, 2026

Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children
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Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children

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Residual Oil-Based Contrast Medium Mimicking a Metallic Foreign Body After Cesarean Section: Diagnostic Value of

Mizuho Fukuda1, Kyosuke Kagami1, Iwao Yasoshima1

  • 1Department of Obstetrics and Gynecology, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan.

The Journal of Obstetrics and Gynaecology Research
|February 12, 2026
PubMed

A 36-year-old woman underwent an elective cesarean section at 37 weeks of gestation. A postoperative abdominal X-ray unexpectedly revealed a 20 mm hyperattenuating pelvic lesion. Computed tomography (CT) demonstrated a dense structure exceeding 3000 Hounsfield units with metallic-like artifacts, suggesting a retained metallic object. Intraoperative video review and instrument count confirmed no missing items. Three-dimensional CT reconstruction and open-source artificial intelligence (AI)-based shape analysis found no similarity to metallic instruments. Review of the patient's history revealed prior hysterosalpingography with oil-based iodinated contrast medium. Retrospective assessment of prenatal magnetic resonance imaging (MRI) showed a cystic lesion with high signal intensity on T1- and T2-weighted images, with signal suppression on fat-suppressed T1-weighted imaging, consistent with fatty components. The lesion was diagnosed as a pseudocyst due to residual contrast medium. This case demonstrates that oil-based contrast can mimic metallic density, and that AI-assisted three-dimensional CT and MRI review can prevent unnecessary reoperation.

Keywords:
artificial intelligencecesarean sectioncomputed tomographycontrast mediamagnetic resonance imaging

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