[Malignant histiocytosis].

Recenti Prog Med

Published: April 1984

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Background: Rosai-Dorfman disease (RDD), also known as sinus histiocytosis with massive lymphadenopathy, is a rare non-malignant disorder characterized by excessive proliferation of histiocytes, the cause of which remains unknown. Although the lymph nodes are the most commonly affected site, some patients may present with extranodal involvement, particularly in the skin, nasal cavity, eyes, and bones. In this report, we aim to present a unique case of RDD with pleural involvement in a 61-year-old patient.

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Objectives: To describe the clinical presentation and clinicopathological findings of dogs with nodular splenic lesions composed of heterogeneous cell components associated with systemic inflammation and to provide information on the outcome after surgical resection.

Materials And Methods: Medical records were searched for dogs with histologically and immunohistochemically characterised nodular splenic lesions with mixed stromal, histiocytic and lymphoid cells and the presence of systemic inflammatory markers at the time of diagnosis.

Results: Four dogs were included, of which three had an undifferentiated splenic stromal sarcoma and one had a splenic leiomyosarcoma.

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Synchronous clonally related anaplastic large cell lymphoma and malignant histiocytosis.

Diagn Pathol

January 2025

Laboratoire Hospitalier Universitaire de Bruxelles - Universitair Laboratorium Brussel, Université Libre de Bruxelles LHUB-ULB, Brussels, Belgium.

Background: Synchronous malignant histiocytoses are rare conditions that occur concurrently with another hematologic neoplasm. Most reported cases are associated with B-cell lymphoproliferative disorders, while associations with T-cell hemopathies are less common. These two diseases may share mutations and/or cytogenetic anomalies, which can lead to malignant proliferations.

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Langerhans cell histiocytosis (LCH), juvenile xanthogranuloma (JXG) family lesions, and Rosai-Dorfman-Destombes disease (RDD) are now classified by the World Health Organization (WHO) under the heading of histiocytic/dendritic cell neoplasms. Each disease may manifest as a focal lesion, as multiple lesions, or as a widespread aggressive systemic disease with visceral organ involvement. Erdheim-Chester disease (ECD) is a rare systemic disease process of adults with limited cases in children.

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A 5 yr old chihuahua presented to our clinic with a complaint of decreased activity and focal seizures. Based on the findings of MRI and computed tomography, a primary brain tumor originating from the right frontal lobe region was suspected. Surgical resection was performed, and a diagnosis of histiocytic sarcoma was made via histopathological examination and immunohistochemical staining.

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