An axial T2W MR image of a 32-year-old woman shows a large well-defined heterogeneous mass in the anterior abdominal wall involving the right rectus abdominis. There are a few linear band (arrowheads) of low signal intensity with in the mass, which are seen in all pulse sequences.
- Also known as abdominal desmoid
- Predilection to develop in women of child-bearing age (usually 20-30 years)
- Mass in abdominal wall typically develops following pregnancy
- Most common muscle involved: rectus abdominis, internal oblique
- Some of the masses have estrogen receptor
- May be seen as a manifestation of Gardner's syndrome
- Rx = surgical removal but recurrence rate 15-40%
- Heterogeneous intramuscular mass (well- or ill-defined)
- Non-enhancing bands of low signal within the mass on all pulse sequences (probable fibrosis)
- Linear fascial extension "fascial tail sign"
Kransdorf MJ, Murphy MD. Imaging of soft tissue tumors, 2nd ed, 2006.