Dysplasia is not well studied, but it is not thought to be dangerous. It represents an in-between category that is neither normal nor cancerous.
Approximately one third of patients with pure dysplasia will have irritative voiding symptoms, one third will have hematuria, and one third will have no symptoms at all. Some patients will have an abnormal urine cytology result. Approximately 20% of patients with dysplasia will eventually develop carcinoma in situ or bladder cancer.