Mucinous cystadenocarcinoma of the urachus associated with pseudomyxoma peritonei with emphasis on MR findings.

Urachal mucinous cystadenocarcinoma associated with pseudomyxoma peritonei is extremely rare; only 11 cases are reported. We describe the characteristic imaging findings of this disorder and correlate imaging features by computed tomography, magnetic resonance imaging, and ultrasonography with operative findings and histopathologic specimens.