Tests and diagnosisBy Mayo Clinic staff
Atypical hyperplasia is usually discovered after a biopsy to evaluate a suspicious area found on a mammogram or during a clinical breast exam. During the biopsy, tissue samples are removed and sent for analysis by a specially trained doctor (pathologist). The tissue samples are examined under a microscope, and the pathologist identifies atypical hyperplasia, if it's present.
To further evaluate atypical hyperplasia, your doctor may recommend surgery to remove a larger sample of tissue to look for breast cancer. A diagnosis of atypical hyperplasia may lead to a surgical biopsy (wide local excision or lumpectomy) to remove all of the affected tissue. The pathologist looks at the larger specimen for evidence of in situ or invasive cancer.
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