Monarch Disease Ontology entry MONDO_0021102 (prostate phyllodes tumor) is an unusual, biphasic benign or malignant neoplasm that arises from the prostate gland. It is characterized by the presence of an epithelial glandular component and a proliferating stroma. Also known as: cystosarcoma phyllodes of prostate, cystosarcoma phyllodes of the prostate, phyllodes neoplasm of prostate, phyllodes neoplasm of the prostate, phyllodes tumor of prostate, phyllodes tumor of the prostate, phyllodes tumour of prostate, phyllodes tumour of the prostate.