A review of data from more than two decades of sonograms in women with ovarian masses showed that serial sonograms can prevent unneeded surgery in women with benign masses and can be used to detect progressive lesions. The report notes that within one year, about 33% of low-risk lesions and more than 75% of high-risk lesions resolved. Further, as the clinicians gained experience, they became better at distinguishing cancerous masses from benign ones as the cancers detected at surgery increased from 8% to 25% over the study period.

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