Case report. The iron rim sign

Late CT manifestations in spontaneous lobar hematoma

PURPOSE

The purpose of this work was to determine the late CT manifestations of spontaneous lobar hematoma.

METHOD

Serial CT studies were performed in 75 cases. The initial study was done during the acute stage of stroke, and the subsequent one was performed at least 6 months later.

RESULTS

There were 20 cases (27%) with no trace of previous hemorrhage, 14 (19%) with a slit cavity, 11 (15%) with a small round cavity, 20 (27%) with pseudoinfarct, 8 (11%) with ventricular deformity but no residual cavity, and 2 (3%) with only calcification at the site of the hemorrhage.

CONCLUSION

Our data show that the typical residual slit was relatively uncommon in lobar hematomas and that, depending on their size, hematomas would disappear, reduce to a small cavity, or form a pseudoinfarct.

Third ventricular choroid plexus arteriovenous malformation simulating a colloid cyst. Case report

A case of a cystic encapsulated arteriovenous malformation arising from the tela choroidea of the third ventricle is reported. Although the appearance of this lesion on computerized tomography scan suggested a colloid cyst by its location, it was atypical because of the non-homogeneity both before and after contrast infusion. The increased density on the unenhanced scan was due to hemosiderin pigment in the capsule wall caused by old hemorrhage. The diagnosis in this case was made by histological examination.