The authors describe a rare pediatric case of cystic lymphangioma arising from the Retzius space. A 9-year-old boy underwent an appendectomy in a nearby hospital after a sudden onset of severe hypogastralgia. When laparotomy revealed a retroperitoneal mass, he was referred to our hospital. After diagnosis of a multicystic mass in the Retzius space, extirpation of the cystic lesion was performed. Histological evaluation of the resected specimens revealed cystic lymphangioma. The patient has been free of symptoms for 6 years since the operation.

We presented three patients with bilateral breast tumors (one with breast cancers, one with breast cancer and fibroadenoma, and one with fibroadenomas) examined by 99mTc-hexakis 2-methoxy-isobutylisonitrile (MIBI) scintimammography. In all cases 99mTc-MIBI uptake was recognized only in the breast cancers. 99mTc-MIBI scintimammography was useful in evaluating bilateral breast tumors since preoperative diagnosis is valuable in determining correct surgical treatment.