Stromal Tumour of Uncertain Malignant Potential of the Prostate (STUMP) - A Case Report

A prostatic stromal tumour of uncertain malignant potential (STUMP) is a non-epithelial, mes-enchymal spindle-cell tumour that can be classified as a specialised stromal tumour of the pros-tate. Although in most cases STUMP is not of an aggressive nature, occasional cases have been doc-umented with an extension into adjacent tissues or recurrence after resection. A minority of cases develop a sarcomatous dedifferentiation.We report the case of a 53-year-old male with symptoms of febrile prostatitis. After consolida-tion we performed TUR-P due to uri-nary reten-tion. Finally, we made the pathologi-cal diagnosis of prostatic STUMP. The patient is being seen -frequently in our clinic to take prostate biop-sies to exclude a progression into a stromal sarcoma (active surveillance). After 13 months the STUMP is still detectable, but with no signs of sarcoma.