A benign (non-cancerous) tumor that forms from glandular tissue in the bladder and contains cyst-like structures.
From Greek 'kystis' (bladder) + 'aden' (gland) + 'oma' (tumor); the compound literally means 'bladder-gland-tumor' and describes tumors with both cystic and glandular features.
Cystoadenomas are rare and often discovered accidentally during imaging for other problems, and because they're benign, doctors often simply monitor them with ultrasounds rather than operating, unless they cause bothersome symptoms.
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