Prostatic Stromal Tumor of Uncertain Malignant Potential Which Was Difficult to Diagnose

الملخص EN

Here, we report a case of stromal tumor of uncertain malignant potential (STUMP) that was difficult to diagnose.

A 53-year-old male was found to have a hard nodule on digital rectal examination; magnetic resonance imaging revealed a large nodule on the left side of the prostate, indicating prostate cancer.

However, pathological diagnosis of the biopsy specimen was benign prostatic hyperplasia.

Although a papillary tumor in the prostatic urethra was also seen on urethrocystoscopy, the tumor specimen obtained from transurethral resection was not malignant.

The tumor in the prostatic urethra recurred only 3 months after transurethral resection, and pathological findings revealed benign hyperplasia not only in the stromal tissue but also in the epithelium; therefore, the prostate tumor was suspected to be STUMP.

It took many prostate pathologists a long time to reach the final diagnosis of STUMP.

STUMP is a rare benign tumor, difficult to diagnose, and sometimes transforms into stromal sarcoma.

Thus, we should consider radical resection in such cases.