Pseudomyxoma peritonei (PMP) is a rare clinical entity in which a diffuse collection of intraperitoneal gelatinous fluid is associated with gelatinous implants on the peritoneal surfaces and omentum. Hematogenic or lymphatic metastasis is extremely rare. In addition, an inguinal mass as an initial presentation is also relatively rare. This is a case report of a PMP patient who had splenic metastasis and showed an inguinal tumor as an initial presentation. A 59-year-old female patient, who had undergone bilateral oophorectomy because of a ruptured ovarian mucinous tumor of boderline malignancy 12 years previously, presented a presumptive diagnosis of a left inguinal irreducible hernia. Computed tomography revealed a low density mass in the pelvic cavity and in the inguinal lesion, as well as in the spleen without any diseases around the organ. The preoperative serum carcinoembryonic antigen (CEA) level was elevated. The patient underwent a resection of gelatinous tumor in the pelvic cavity, splenectomy, and appendectomy, as well as left inguinal herniorrhaphy. Histological examinations revealed a splenic metastasis of PMP originating from the ovarian low-grade mucinous tumor. She received postoperative intraperitoneal lavage as well as chemotherapy, and has survived for over 7 years postoperatively without any evidence of recurrence, as confirmed by repeated follow-up CT examinations and CEA determination. Splenic metastasis of PMP is extremely rare; this represents only the third reported case of its kind in the literature. Furthermore, it should be noted that an inguinal tumor can sometimes be an initial presentation of PMP.