Rapidly growing abdominal wall desmoid tumor during pregnancy

Discussion:

Small abdominal wall desmoid can be seen in retrospect on the CT urogram. It grew very rapidly and was detected during pregnancy, with pathology confirmed by ultrasound-guided biopsy (low-grade spindle cell neoplasm, consistent with desmoid-type fibromatosis). The mass continued to grow post-partum and the patient underwent tamoxifen therapy. 

There are important associations with desmoid tumors growing during or after pregnancy, particularly in the rectus musculature. Although poorly understood, it is felt that a combination of abdominal wall trauma/stretching and hormonal and immunological factors play roles. 

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