Omental-mesenteric inflammatory pseudotumor. Cytogenetic demonstration of genetic changes and monoclonality in one tumor

Abstract

Background: Extrapulmonary inflammatory pseudotumor (plasma cell granuloma) is an uncommon lesion in adults and children, and little is known either of its etiology or clinical characteristics. However, it remains a significant source of morbidity to patients and confusion to clinicians.

Methods: Case reports are presented of three patients with intraabdominal inflammatory pseudotumor who recently underwent surgery. A review of the recent world literature is also presented. Clinical and laboratory characteristics of omental-mesenteric inflammatory pseudotumor are reviewed along with a discussion of its etiology.

Results: Cytogenetic data from cells of one patient show a derivative chromosome evolved from a translocation between the long arm of chromosome 2 and the short arm of chromosome 9 [(2;9)(q1,3;p2,2)].

Conclusions: The lesion is monoclonal, and genetic changes may play a crucial role in the development of this neoplasm. Omental-mesenteric inflammatory pseudotumor appears to represent a distinct clinicopathologic entity as a benign neoplasm in children.