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      Retroperitoneal lipoma arising from the urinary bladder

      case-report

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          Abstract

          Retroperitoneal benign lipomas are extremely rare and represent about 2.9% of all primary retroperitoneal tumors. About 80% of the tumors in the retroperitoneal cavities are malignant neoplasms. We experienced a case of a retroperitoneal lipoma simulating an ovarian mature cystic teratoma. A diagnosis was correctly made by magnetic resonance imaging (MRI) prior to surgery, and a total tumorectomy was performed. The retroperitoneal lipoma was recognized to have arisen from the urinary bladder. Histological sections revealed a tumor consisting of typical adipose cells without atypia. These types of lipomas should be carefully followed-up because they often recur and undergo malignant transformations.

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          Rearrangement involving chromosomes 1 and 8 in a retroperitoneal lipoma.

          Cyril Foa, Claire Mainguené, Florence Dupré … (2002)
          Superficial lipomas are very common benign adipose tissue tumors. In contrast, deep-seated lipomas such as retroperitoneal lipomas, are extremely rare and have to be carefully distinguished from well-differentiated liposarcomas for appropriate treatment and follow-up. We report to, our knowledge, the first cytogenetic analysis of a retroperitoneal lipoma occurring in an adult, which showed a complex rearrangement interpreted as t(1;8)(q32;q22-q23) followed by a pericentric inversion of der(8). There was no detectable rearrangement of chromosome 12, and in particular no 12q14-q15 amplification. Because rearrangements of the 8q11-q13 region involving the PLAG1 gene have been described in lipoblastoma-another kind of benign adipose tumor--we used fluorescence in situ hybridization analysis to determine in the present case the chromosomal breakpoint on 8q was located between the ETO (8q22) and COX6C (8q22-q23) genes at a great distance from PLAG1. Karyotypic analysis of additional cases of retroperitoneal lipomas will be required to assess the significance of chromosome 1 and 8 rearrangements in a continuous effort to attain a better classification of adipose tissue tumors. Of great importance is the determination of such genetic markers as additional tools for the differential diagnosis between benign and malignant forms of adipose tumors, and to avoid erroneous diagnoses.
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            Lipoma-like tumor mass probably arising in the retroperitoneal heterotopic pancreas: a previously undescribed lesion.

            M Mitani, Yoriko Murata, T Takahashi … (2004)
            Heterotopic pancreatic tissue is found in several locations of the body. However, to the best of our knowledge, there have been no reports on heterotopic pancreas in the retroperitoneum. A case of retroperitoneal lipoma-like large tumor mass probably arising in the heterotopic pancreas is reported. A 45-year-old Japanese woman was admitted to hospital because of back pain. Imaging modalities showed an abnormal mass in the retroperitoneum separate from the surrounding organs, including the pancreas and kidney. Histologically, the mass consisted of mature adipose tissue and scattered ductal and acinar elements. Although there was no islet tissue in this fatty mass, the epithelial elements suggested heterotopic pancreatic tissue in origin. The present case is very unusual; however, heterotopic pancreas should be considered in the differential diagnosis of retroperitoneal tumors.
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              Primary malignant retroperitoneal tumors.

              Nicola J. Armstrong, I Cohn (1965)
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                Author and article information

                Journal
                Journal ID (nlm-ta): Rare Tumors
                Journal ID (pmc): rt
                Journal ID (publisher-id): rt
                Title: Rare Tumors
                Publisher: PAGEPress Publications (Pavia, Italy )
                ISSN (Print): 2036-3605
                ISSN (Electronic): 2036-3613
                Publication date (Electronic): 22 July 2009
                Publication date Collection: 22 July 2009
                Volume: 1
                Issue: 1
                Affiliations
                [1 ]Department of Obstetrics and Gynecology, Otsu Red-Cross, Otsu, Shiga, Japan;
                [2 ]Department of Pathology, Otsu Red-Cross, Otsu, Shiga, Japan;
                [3 ]Department of Radiology, Otsu Red-Cross, Otsu, Shiga, Japan
                Author notes
                Correspondence: Masafumi Koshiyama, Department of Obstetrics and Gynecology, Otsu Red-Cross Hospital, 1-1-35, Nagara, Otsu, Shiga, 520-0046, Japan E-mail: koshiyamam@ 123456nifty.com

                Contributions: SU and MK, substantial contributions to conception and design, acquisition of data, or analysis and interpretation of data; all authors are responsible for drafting the article or revising it critically for important intellectual content; MK, final approval of the version to be published; all members are medical doctors of Otsu Red-Cross Hospital.

                Conflict of interest: the authors reported no potential conflict of interests.

                Article
                Publisher ID: rt.2009.e13
                DOI: 10.4081/rt.2009.e13
                PMC ID: 2994430
                PubMed ID: 21139884
                SO-VID: 93053b70-ac19-47f3-958c-52c120e78f19
                Copyright statement: ©Copyright S. Ukita et al., 2009
                License:

                This work is licensed under a Creative Commons Attribution 3.0 License (by-nc 3.0)

                Product
                Categories
                Subject: Case Report

                ScienceOpen disciplines: Oncology & Radiotherapy
                Keywords: urinary bladder,lipoma,ovarian mature cystic teratoma,retroperitoneum,magnetic resonance imaging.
                Data availability:
                ScienceOpen disciplines: Oncology & Radiotherapy
                Keywords: urinary bladder, lipoma, ovarian mature cystic teratoma, retroperitoneum, magnetic resonance imaging.

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