Post-operative breast seroma
Previous segmental resection for carcinoma breast. Follow up 6 months after surgery.
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A thick walled fluid collection (there is posterior acoustic enhancement) located in the surgical scar. The scar is visible extending to your left on the image.
This seroma is stable compared with the study of 3 months before. The thick walled appearance is typical but not pathognomonic for a seroma. The almost nodular appearance of the wall is also seen in fat necrosis.
Anecdotally it seems that once the seroma is thick walled as in this case, it does not resolve any further. Aspiration is easy under ultrasound guidance and often gives symptomatic relief.