Diagnostic dilemma: Biopsy triggered 'spontaneous regression' of woman's arm tumor
A 59-year-old woman in Wisconsin experienced a rare case of spontaneous regression of a tumor in her arm following a biopsy. Initially diagnosed with myxofibrosarcoma, the tumor began to shrink significantly after the procedure. Doctors decided to remove the tissue where the lump had been to ensure disease control despite its disappearance.
- ▪The patient noticed a rapidly growing mass in her right arm and sought medical attention.
- ▪Doctors performed a core needle biopsy and diagnosed her with myxofibrosarcoma, a type of soft tissue cancer.
- ▪After the biopsy, the tumor shrank significantly and could no longer be felt, prompting further surgical intervention.
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Health Viruses, Infections & Disease Cancer Diagnostic dilemma: Biopsy triggered 'spontaneous regression' of woman's arm tumor Doctors describe a strange case in which a tumor in a woman's arm disappeared without specific treatment. By Nicoletta Lanese published 20 May 2026 in Features When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. MRIs of the woman's right arm showed a "ovoid soft tissue mass" just under the skin. (Image credit: Gannon M. C., Gabor R. M., Gupta A., et al. (April 15, 2026) Spontaneous Regression of Soft Tissue Sarcoma Following Biopsy: A Case Report and Systematic Review of the Literature. Cureus 18(4): e107111.
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