J Korean Radiol Soc.  1990 Aug;26(4):697-703. 10.3348/jkrs.1990.26.4.697.

CT analysis of extracerebral hypodense fluid collection

• Kim MY
• Suh CH
• Lee SH
• Choi HR
• Ahn BY
• Chung WK

• KMID: 2359482
• DOI: http://doi.org/10.3348/jkrs.1990.26.4.697

Abstract

It is difficult to identify the exact localization, subarachnoid space or subdural space, when hypodense extracerebral fluid collection is seen on initial or follow up brain CT scan. In cases with extracerebral fluid collection, CT findings are nonspecific and it is not always possible to confirm the exact location. We reviewed CT findings of 31 cases a with hypodense extracerebral fluid collection for the purpose of establishing diagnostic criteria between subarachnoid space and subdural space. The findings were classified to three types according tobilaterality and configuration of cortical sulci; type I, widening of bilateral extracerebral space and corticalsulci widening, type II, widening of bilateral extracerebral space and cortical sulci obliteration, and type III,widening of unilateral extracerebral space and cortical sulci obliteration. Frontal extracerebral space is the most frequent site of extracerebral fluid collection. Bilateral symmetricity is promoinent in type I, trauma related intracranial lesions are frequently associated with type II and type III. All cases of Type I is limited below two years of age. Bilateral cortical sulci widening is the finding of subarachnoid fluid collection and cortical sulci obliteration is strongly suggestive finding of subdural fluid collection.

MeSH Terms

Brain
Follow-Up Studies
Subarachnoid Space
Subdural Space
Tomography, X-Ray Computed