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John Allcock and a brief history of Allcock’s test
  1. Visish M Srinivasan1,
  2. Michael George Zaki Ghali2,
  3. Peter Kan1
  1. 1Department of Neurosurgery, Baylor College of Medicine, Houston, Texas, USA
  2. 2Department of Neurobiology and Anatomy, Drexel University, Philadelphia, USA
  1. Correspondence to Dr Visish M Srinivasan; visishs{at} and Dr Michael George Zaki Ghali, Drexel University, Philadelphia, PA 19104, USA; mgg26{at}

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Recently, we have read several articles referencing a commonly used test for assessing collateral circulation across the posterior communicating artery (PCoA), known as Allcock’s test. This eponymous test, described by James Allcock, a pioneering neuroradiologist, was unfortunately missspelled as ‘Alcock’s’ test in several publications.1–5 We would like to take this opportunity to briefly discuss the test itself and a brief history of Dr Allcock’s contributions.

The story of Dr John Allcock and Dr Charles Drake exemplifies the strength of collaboration between neuroradiologists and neurosurgeons.6 While Drake is a household name among neurosurgeons worldwide, few are familiar with Allcock, one of his chief collaborators.7 Drake first described …

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  • Contributors VMS, MGZG, and PK meet the criteria for authorship.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; internally peer reviewed.