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Study of the hypoplasic internal carotid artery by use of multislice spiral computed tomography. Two case reports

B. Ibarra-De Grassa, F.J. Romero-Vidal, M.d. Alarcón-Alcaraz, J.F. Arenillas-Lara, L.J. Fernández-Lara, P. Coscojuela-Santaliestra [REV NEUROL 2002;35:832-837] PMID: 12436381 DOI: https://doi.org/10.33588/rn.3509.2002332

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Volumen 35 | Number 09 | Nº of views of the article 38.623 | Nº of PDF downloads 229 | Article publication date 01/11/2002

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ABSTRACT

INTRODUCTION Hypoplastic internal carotid artery (HICA) is a rare benign congenital malformation . Its angiographic image ‘string sign’ is shared by entities that may be either medically or surgically treated . We report two cases diagnosed by helical computerized tomography (HCT). CASE REPORTS. Case 1: woman diagnosed clinically and by magnetic resonance (MR) of Chiari I malformation with associated syringomyelia. An HCT of the craniocervical junction was done to rule out osseous malformations. An hypoplastic posterior fossa (PF) with small right carotid foramen was diagnosed. An arteriography with HCT was done that showed the carotid string sign. Case 2: a 82 yearsold hypertensive woman with left hemiparesia and homonymous hemianopsia was diagnosed of right temporooccipital infarct. An HCT arteriography disclosed occlusion of the right posterior cerebral artery, calcification of the left carotid siphon and stenosis of the right siphon. Bi and tridimensional reconstructions of the circle of Willis, cranial base and distal cervical carotid arteries showed an hypoplastic right carotid artery and foramen.

CONCLUSIONS Multislice HCT is a recently incorporated diagnostic tool that allows a volumetric study in a short period of time, seconds. An angiographic study can be done intravenously in cases of vascular anomaly suspiction, hypoplastic carotid artery in the reported cases. HCT is the only current imaging tool that can diagnose this anomaly without the aid of other imaging studies. KeywordsArteriography Helical computerized tomography Internal carotid artery

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Nota Clínica

Study of the hypoplasic internal carotid artery by use of multislice spiral computed tomography. Two case reports