Brain metastasis from extramammary Paget's disease.

Herein, we present a case of extramammary Paget's disease with brain metastasis that was diagnosed pathologically for the first time in Japan. Moreover, invasive extramammary Paget's disease (with distant metastasis) highly resistant to treatment. Only for brain metastasis, we may control the tumor by surgical resection and stereotactic radiosurgery (SRT) for the treatment of intracranial metastases was assessed. An 76-year-old man was diagnosed with extramammary Paget's disease of the vulva at nearby hospital. Surgical resection and sentinel lymph node dissection were then performed, and the patient received chemotherapy because multiple lymph node metastases were suspected. The patient's response to chemotherapy was poor, and he was in the state of Progressive Disease. He complained of dyslexia and was referred to another hospital when he was 81 years old. Plain magnetic resonance imaging (MRI) was conducted, and two brain tumors in the vicinity of the left cerebellar tent were suspected. In our hospital, gadolinium contrast-enhanced MRI was performed and showed a tumor in the cerebellum (left posterior temporal lobe) and another tumor under the tent (left cerebellar hemisphere). Significant edema was also noted. Based on these findings, the intracranial lesion was diagnosed as metastatic brain tumor. The pathological diagnosis was brain metastasis from extramammary Paget's disease. Postoperative intracranial residual disease was treated with stereotactic radiosurgery. MRI showed that the size of the cerebellar lesions decreased, and no recurrence of cerebral lesions was observed. SRT for extracranial lymph node metastases was performed. Mass reduction and SRT may be the best way to treat brain metastasis from extramammary Paget's disease.