What is this stringy lump?

An unusual set of symptoms prompts referral for imaging

Sandra, a 34-year-old woman, presents to emergency with a progressive superficial pain from her right lower rib cage to her upper abdominal region.

woman suffering back ache

In the three weeks prior to presentation, she had noticed intermittent discomfort in the area, particularly with movement such as running and raising her arms overhead.

Over the subsequent weeks, the pain had became increasingly severe and constant.

She has also become aware that the skin area has become tender and firm to touch.