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Peer-reviewedCC BY-NC-NDInternal Medicine

Aberrant Left Subclavian Artery Hypoplasia with Right Aortic Arch as a Cause of Inter-arm Blood Pressure Difference and Subclavian Steal in an Asymptomatic Adult

  • Kazuhito Hirata
  • Masanori Kakazu
  • Osamu Arasaki
  • Kouhei Narayama
  • Akihiko Yamauchi
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Abstract

A 30-year-old asymptomatic man was evaluated for an inter-arm blood pressure (BP) difference; his left arm BP was 15-20 mmHg lower than that of the right arm. Doppler ultrasonography revealed left subclavian artery occlusion with subclavian steal. Contrast-enhanced CT revealed a right aortic arch and an aberrant left subclavian artery with severe proximal hypoplasia. A right aortic arch with abnormal supra-aortic branching is usually diagnosed perinatally or in infancy because of congenital heart disease or vascular ring symptoms. Although rare in asymptomatic adults, congenital aortic arch anomalies should be considered in patients with right aortic arch and interarm BP differences.

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Cite

BibTeXRIS
BibTeX
@article{hirata2026aberrant,
  title = {{Aberrant Left Subclavian Artery Hypoplasia with Right Aortic Arch as a Cause of Inter-arm Blood Pressure Difference and Subclavian Steal in an Asymptomatic Adult}},
  author = {Kazuhito Hirata and Masanori Kakazu and Osamu Arasaki and Kouhei Narayama and Akihiko Yamauchi},
  journal = {Internal Medicine},
  year = {2026},
  month = sep,
  doi = {10.2169/internalmedicine.7703-26},
  url = {https://www.jstage.jst.go.jp/article/internalmedicine/advpub/0/advpub_7703-26/_article},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - Aberrant Left Subclavian Artery Hypoplasia with Right Aortic Arch as a Cause of Inter-arm Blood Pressure Difference and Subclavian Steal in an Asymptomatic Adult
AU  - Kazuhito Hirata
AU  - Masanori Kakazu
AU  - Osamu Arasaki
AU  - Kouhei Narayama
AU  - Akihiko Yamauchi
PY  - 2026
DA  - 2026/09/15
JO  - Internal Medicine
DO  - 10.2169/internalmedicine.7703-26
UR  - https://www.jstage.jst.go.jp/article/internalmedicine/advpub/0/advpub_7703-26/_article
AB  - A 30-year-old asymptomatic man was evaluated for an inter-arm blood pressure (BP) difference; his left arm BP was 15-20 mmHg lower than that of the right arm. Doppler ultrasonography revealed left subclavian artery occlusion with subclavian steal. Contrast-enhanced CT revealed a right aortic arch and an aberrant left subclavian artery with severe proximal hypoplasia. A right aortic arch with abnormal supra-aortic branching is usually diagnosed perinatally or in infancy because of congenital heart disease or vascular ring symptoms. Although rare in asymptomatic adults, congenital aortic arch anomalies should be considered in patients with right aortic arch and interarm BP differences.
SN  - 1349-7235
SN  - 0918-2918
ER  -