Multiple billiary hamartomas accompanying mature cystic teratoma with thyroid component

The mature cystic teratomas (MCT) constitute the majority of ovarian germ cell tumors. It is uncommon seen postmenopausal period and thyroid tissues are found in 3.5-20% of these tumors on pathologic examinations. Multiple biliary hamartomas (MBH) or von Meyenburg complexes are rare benign neoplasms of the liver, composed of disorganized bile ducts and ductules and fibrocollagenous stroma. We present a postmenopausal women presenting with abdominal mass. Abdominal US and CT of the case revealed a contrast enhanced cystic mass with solid component within pelvis. Besides, multiple hypodense lesions, which were thought initially as metastasis, were detected in the liver. Abdominal MR, MRCP and liver biopsy revealed that the lesions within the liver are multiple biliary hamartomas. Pathological investigation of the mass after the operation revealed that the pelvic mass is a mature cystic teratoma composed of mostly mature thyroid tissue. To our knowledge, there is no report on association of MBH and MCT in the literature.