Elsevier

Human Pathology

Volume 23, Issue 4, April 1992, Pages 454-464
Human Pathology

Original contribution
Ovarian involvement by the intra-abdominal desmoplastic small round cell tumor with divergent differentiation: A report of three cases

https://doi.org/10.1016/0046-8177(92)90094-JGet rights and content

Abstract

Three girls, one 14 and two 15 years of age, with the recently described neoplasm that has been designated “intra-abdominal desmoplastic small round cell tumor with divergent differentiation,” and ovarian involvement at presentation are described. In two cases the ovarian tumor was initially thought to be the primary neoplasm. In all cases there was extensive extraovarian tumor at the time of presentation. The ovarian involvement was bilateral in two cases and unilateral in the third. Microscopic examination showed prominent nodular growth within the ovaries. The tumors were characterized predominantly by nests of small cells with hyperchromatic nuclei and scant cytoplasm separated by a prominent desmoplastic stroma. A few tubules containing mucinous secretion were present in one case. On immunohistochemical staining many of the tumor cells stained positively for cytokeratin, epithelial membrane antigen, desmin, and vimentin. Staining for neuron-specific enolase was present in two cases but was conspicuous in only one of them. Leu-7 was expressed by the tumor cells in two cases, and S-100 protein by one, giving further support to the possiblity of neuroectodermal differentiation within some of these neoplasms. The two cases studied by electron microscopy both showed frequent intercellular junctions, basal lamina, cytoplasmic filaments, and sparse, small dense granules of either neuroendocrine or lysosomal type. Paranuclear aggregates of filaments were found in one case and cellular processes were prominent in the other case. The differential diagnosis in these cases was extensive and included a number of small cell tumors that may involve the ovary, either primarily or secondarily, in young females. The desmoplastic small round cell tumor should be considered in such cases when the appearances on routine examination are consistent with the diagnosis, and appropriate immunohistochemical stains should be performed to confirm the diagnosis.

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