Table 2.
Comparable pseudotumor classifications in MARS MRI and low-dose 3-D CT
| MARS MRI |
CT |
||
|---|---|---|---|
| Type | Description | Type | Description |
| Type 1 | Flat, thin-walled (≤ 2 mm), fluid-like content (hypointense on T1 and hyperintense on T2) | Type 1 | Flat, thin-walled (≤ 2 mm), fluid- like content (less attenuation than skeletal muscle) |
| Type 2a | Not flat, thick-walled (> 2 mm), fluid-like content | Type 2a | Not flat, thick-walled (> 2 mm), fluid-like content |
| Type 2b | Any shape, thick-walled (> 2 mm), atypical fluid (hyperintense on T1 and variable on T2) | Type 2b | Any shape, thick-walled (> 2 mm), atypical fluid (greater attenuation than skeletal muscle) |
| Type 3 | Any shape, mixed signal, solid throughout | Type 3 | Any shape, mixed attenuation, solid throughout |
(Hart et al. 2012) Adapted from (Hart et al. 2012)