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Rectus abdominis desmoid tumor

Case contributed by Dr Michael P Hartung


Palpable mass in the right abdominal wall.

Patient Data

Age: 30 years
Gender: Female

Oval hypoechoic vascular mass in the right rectus abdominus muscle measuring 1.6 x 1.3 x 2.2 cm. 

Case Discussion

Ultrasound-guided biopsy confirmed desmoid-type fibromatosis. 

This young female patient noticed this mass which slightly grew over two years, and only slightly during pregnancy. 

The relationship of desmoids to pregnancy is complex and poorly understood. It is suspected that a combination of birth-related trauma related to muscular/fascial stretching and the hormonal and immunological changes of pregnancy play key roles. There is an increased risk of desmoid tumors arising in and around pregnancy, and (interestingly) they most commonly occur in the right rectus abdominis muscle as in this case 1. They often regress after pregnancy, and many tumors (~50%) respond to the anti-estrogenic drug tamoxifen. 

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Case information

rID: 75333
Published: 25th Mar 2020
Last edited: 26th Mar 2020
Inclusion in quiz mode: Included

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