Magnetic resonance imaging of typical polypoid adenomyoma of the uterus in 8 patients: correlation with pathological findings.

OBJECTIVE

To study the magnetic resonance imaging findings of typical polypoid adenomyoma and correlate radiological findings with histopathologic findings.

METHODS

Magnetic resonance imaging and histopathologic findings were retrospectively reviewed in 8 patients. The size, location, polyp's shape, and signal intensity of magnetic resonance imaging findings were evaluated.

RESULTS

The polyp's shape of 8 cases is pedunculated in 7 and sessile in 1, and all 8 cases are well circumscribed. Four cases (50%) show an isointense mass relative to the myometrium with small or large hyperintense foci on T1-weighted imaging (T1WI) or T2-weighted imaging (T2WI), reflecting the fascicle of smooth muscle with islands of hemorrhagic endometrial tissue. One case forms a large hemorrhagic cavity, being hyperintense on T1WI and hypointense on T2WI. Three cases (37%) show almost homogeneous isointense or hyperintense mass on T2WI.

CONCLUSIONS

When there is a well-defined polypoid mass protrusion into the uterine endometrial cavity that is isointense relative to the myometrium with small or large foci of high signal on T1WI or T2WI in a premenopausal woman, typical polypoid adenomyoma can be considered in the differential diagnosis.