Abstract
The existence of the rete carotids has been recognised for many years in ruminants and other species (Ask-Upmark, 1935; Daniels, Dawes and Pritchard, 1953). Varying degrees of hypoplasia of the internal carotid artery occur and the cerebral circulation is derived from branches of the external carotid artery such as the internal maxillary artery, the occipital artery and also from the posterior fossa circulation. The internal maxillary artery supplies the terminal portions of the internal carotid artery via a network of small anastomotic vessels related to the division of the trigeminal nerve, called the rete carotidis (or rete mirabile caroticum). This anomally of the circulation is extremely rare in man, only two other cases are described in the radiological literature (Minagi and Newton, 1966; Hawkins and Scott, 1967). The following case is the only example of this condition seen by one of the authors (J.V.O.) in 10,000 cerebral angiograms. A 45-year-old female who had been treated for thyrotoxicosis by...
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