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Prostatic stromal tumors of uncertain malignant potential (STUMPs) generally arise in older men who usually present with obstructive urinary symptoms. The most common histologic pattern (approx. 50% of cases) consists of highly pleomorphic cells with degenerative type atypia scattered among benign prostatic glands. Other patterns include phyllodes tumor-like growth, hypercellular stroma without atypical cells, and myxoid stroma.