Combined lie ’s type D and type a agenesis of the left internal carotid artery diagnosed by magnetic resonance angiography

ConclusionLie ’s type D ICA agenesis usually does not communicate with the anterior and posterior circulations. We encountered a case of combined type D and type A ICA agenesis. To our knowledge, no similar case has been reported in the English literature. This is the second case of type D ICA agenesis with pat ent ipsilateral PCoA. We speculate that in case of type A ICA agenesis, when the development of the PCoA is insufficient to support collateral blood flow, an anastomotic vessel between bilateral ICAs may develop.
Source: Surgical and Radiologic Anatomy - Category: Anatomy Source Type: research