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Open Access Case report

DNA aneuploidy as a topographic malignant transformation pattern in a pleomorphic adenoma of long-term evolution: a case report

Lorena Gallego1, Luis Junquera2*, Josué Hernando3, Manuel F Fresno4, Ana Salas5 and Tommaso Cutilli6

Author Affiliations

1 Department of Oral and Maxillofacial Surgery. Cabueñes Hospital, 33394, Gijón, Spain

2 University of Oviedo, School of Dentistry, 33009, Oviedo, Spain

3 Department of Oral and Maxillofacial Surgery, Central University Hospital, 33007, Oviedo, Spain

4 Department of Pathology, Central University Hospital, 33007, Oviedo, Spain

5 Cytometry Unit, Scientific-Technological Services, Central University Hospital, 33007, Oviedo, Spain

6 Italy Health Sciences Department, Maxillofacial Surgery Unit, University of L'Aquila, 67100, L'Aquila, Italia

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Journal of Medical Case Reports 2011, 5:541  doi:10.1186/1752-1947-5-541

Published: 4 November 2011

Abstract

Introduction

We present a case of long-term evolution of a submandibular pleomorphic adenoma. There is little information about topographic malignant transformation patterns of pleomorphic adenomas.

Case presentation

We extensively analyze a giant submandibular mixed tumor of 25-year evolution in a 57-year-old Caucasian woman. Deoxyribonucleic acid ploidy was evaluated in different superficial and deep areas using flow cytometry analysis and correlated with pathological and immunohistochemical characteristics. Superficial areas exhibited a typical histological pleomorphic adenoma pattern and were deoxyribonucleic acid diploid. Deep samples showed deoxyribonucleic acid aneuploidy, atypical histological benign features and expression of markers involved at an early-stage of malignant transformation, such as tumor protein 53 and antigen Ki67.

Conclusion

These findings revealed that deep tumor compartments may be involved in the initial stages of malignant transformation. Deoxyribonucleic acid ploidy analysis may provide an additional diagnosis tool and indicate 'uncertain' areas that require careful study to avoid diagnostic errors. Larger studies are needed to confirm our results and to evaluate the usefulness of the technique.