On ADC maps (b), white matter lesions appeared moderately hypointense due to reduced water diffusion.
The degree of T1W hypointensity of the biopsied lesion on pre-biopsy MRI was isointense in 2%, mild to moderately hypointense in 33% and markedly hypointense in 65% of cases.
Associated retinal detachment/haemorrhage (dashed arrows) appears moderately hypointense.
ADC map shows moderately hypointense signal within the mass with an ADC value of 1.4 × 10 −3 mm2/s.
Axial T2W MR image of the same patient shows that the lacrimal gland mass has a very hypointense posterior component (thick arrow) and an anterior moderately hypointense portion (thin arrow).
a. Axial T2W MR image shows a well-circumscribed polypoid mass (thick arrow) of moderately hypointense signal involving the left lacrimal gland.
They are slight hypointense on T1WI but moderately hyperintense on T2WI with irregular large patchy areas of edema signal.
They appear hypointense on T1 images and moderately hyperintense on T2 images and diffusion-weighted imaging (DWI), frequently with a capsular based distribution.
On MRI, the lesion typically appears iso- to hypointense on T1W images and hyperintense on T2W images, although some hemangiomas may display moderately high/low signal intensity.
