A 30-year-old woman complains of abdominal swelling.

Fig. 117.1 (A) Contrast-enhanced axial image shows a moderately enhancing homogeneous lesion in the muscular compartment of the anterior abdominal wall. (B) Noncontrast axial T1-weighted image shows a well-defined midline anterior abdominal wall lesion isointense to muscles in the muscular compartment. (C) Axial T2-weighted image shows a well-defined midline anterior abdominal wall lesion isointense to muscles. (D) Contrast-enhanced coronal T1-weighted image shows an avidly enhancing, well-defined, midline anterior abdominal wall lesion.

Anterior abdominal wall desmoid tumor (aggressive fibromatosis)

• Malignant soft tissue sarcoma
  
• Benign myositis ossificans
  
• Arteriovenous malformation
  
• Extranodal lymphoma
  
• Fibrosarcoma
  
• Malignant fibrous histiocytoma
  
• Metastatic deposits (usually lung carcinoma)