Introduction: The objective of this study is to evaluate the value of CT and MRI for the diagnosis of Cerebral Amyloid Angiopathy (CAA) using Modified Boston Criteria, as the reference standard. Our aim is also to study certain features of Cerebral Amyloid Angiopathy haemorrhage (CAAH) in comparison to hypertensive haemorrhage (HH) on imaging. 
 
 Method: From January 2012 till December 2015, 31 patients admitted for primary intracerebral haemorrhage with both CT and MR imaging done, were investigated retrospectively for the diagnosis of CAAH or HH. Interrater agreement was calculated and features of both CAAH and HH were recorded for assessment. 
 
 Result: Using Modified Boston criteria as a reference standard, a good interrater agreement was achieved using Cohen’s Kappa coefficient with κ of 0.664 in the diagnosis of in vivo CAA-ICH (n=9) and HPT-ICH (n=17). The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were 100%, 77.3%, 64.3% and 100% respectively. Patients in CAAH group were older with a range of age between 70-79, compared with the HH patients. The bleeds were all superficially located with frontal lobe (44.4%) predominant; the majority of the cases (66.7%) have a small volume of haemorrhage < 30mls, according to ICH scoring. SAH and IVH extension was seen in 11.1% and 22.2% respectively, in comparison with the HH with a percentage of 11.8% and 35.8%, respectively. 22.2% had multiple haemorrhages at different lobes and 33.3% had a recurrent haemorrhage. 
 
 Discussion & Conclusion: A modified Boston criteria with combined CT and MR imaging is a reliable, non-invasive method for diagnosis of premortem CAAH with a good interrater agreement. There are certain CT and MRI features to some extent that may assist to distinguish CAAH from HH.

THE COMBINED ROLE OF CT AND MRI IN THE DIAGNOSIS OF CEREBRAL AMYLOID ANGIOPATHY IN PRIMARY INTRACEREBRAL HAEMORRHAGE