Pleural cupula during supraclavicular block — FRCA Primary MCQ
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Correct answer: C — Cupula of pleura extending above the first rib
The best answer is “Cupula of pleura extending above the first rib”. The cervical pleural dome, or cupula, lies close to the brachial plexus at the supraclavicular level. Pleural puncture can produce a pneumothorax. Arterial, lymphatic and sympathetic-chain injury have different consequences and do not directly cause an apical pneumothorax.
Reference: RCoA, Primary FRCA Syllabus: https://rcoa.ac.uk/sites/default/files/documents/2026-01/Primary-FRCA-Syllabus.pdf