MRI CAMRT: Pathology questions with correct answers

Abscess (brain): definition and imaging appearance on T1, T2, CE, and DWI Answer Collection of pus. Mass effect and extensive surrounding edema. T1: hypointense to grey matter T2: hyperintense to grey matter with surrounding edema. CE MRI: ring-like enhancement DWI shows an abscess having a high DWI signal with corresponding low signal on the ADC map. Avascular Necrosis (AVN) Answer T1: necrotic area is hypointense T2: hyperintense bone marrow edema Ischemic area remains hypointense. Double line sign. Hypointense outer line due to sclerosis and fibrosis and a hyperintense inner line. Acoustic neuroma: AKA? Benign or malignant? Appearance on T1, T2, CE? Answer AKA vestibular schwanoma Benign tumour of schwann cells covering the vestibule portion of the 8th cranial nerve (vestibulocochlear nerve). Seen in the cerebellopontine angle