Hepatic metastasis from perianal Paget’s disease without identified underlying carcinoma: a case report

Background Perianal Paget’s disease (PPD) is a rare malignancy, often associated with an underlying adenocarcinoma and a poor prognosis. Case presentation A 69-year-old female was presented with a history of perianal pruritus for 6 months and enlarged inguinal lymph nodes in the left side. Paget cells were confirmed by pathology after a wide excision of perianal skin. Radiotherapy was performed covering the bilateral inguinal lymphatic drainage area. Hepatic metastasis was found 8 months after surgery. Hepatic artery embolization (HAE) and high-intensity focused ultrasound therapy (HIFU) were performed successively. However, hepatic metastasis happened again 3 months later. Ultrasound-guided percutaneous radiofrequency ablation (PRFA) was carried out and various means of inspection could not identify the primary tumor. In the case of rapid progression of the tumor, we gave the patient chemotherapy regimens of XELOX. After 4 cycles of chemotherapy, the tumor marker went down continuously and the hepatic metastasis stayed stable. Conclusions Hepatic metastasis from perianal Paget’s disease without identified underlying carcinoma may benefit from XELOX on the basis of adenocarcinoma.