CT Manifestations of Lateral Ventricle's Fusion and Adherence: An Analysis of 119 Cases

Objective To discuss CT manifestations of the fusion and adherence of the lateral ventricles (FALV).Materials and Methods Cranial CT scans of 1000 normal individuals were retrospectively reviewed. Distorted, coarctated frontal horns and/or shifted septum pellucidum were defined as FALV. Results In normal population, the incidence of FALV was 11.9% and showed no significant difference between male and female. The occurrence of the right side was 2.4 times of that of the left side. FALV could be classified into two types: unilateral (99.16%) and bilateral (0.84%). Unilateral type could be further divided into four subgroups: (1) coarctated frontal horn with shifted septum pellucidum (46.2%), (2) fused lateral ventricle (38.65%), (3) adhered lateral ventricle (11.76%), and (4) cavitation of septum pellucidum (2.5%).Conclusion FALV can be regarded as a normal variation. The most characteristic CT sign of FALV is that the shifted septum pellucidum is definitely accompanied with ipsilateral distorted and coarctated frontal horn, while the course of septum pellucidum is always a straight line.