Reactive sinus histiocytosis of lymph nodes is a very common finding , and undoubtedly in many cases it is largely ignored, since it is often of little or no clinical importance. However, when this finding becomes prominent, it can result in a somewhat alarming appearance. The extreme end of this spectrum occurs in cases of reactive histiocytosis related to prior joint replacement surgery, whic...

Bone marrow biopsy showed infiltration by numerous histiocytes. Some of the histiocytes contained vacuolated cytoplasm whilst others contained granules that stained deep blue with the May-Grünwald-Giemsa stain (Figure 2). This histological pattern was indicative of Niemann-Pick disease. Confirmation of this diagnosis was obtained by lysosomal enzyme assay that showed undetectable sphingomyelina...

Trephine biopsy was performed which showed hypercellular marrow space and several ill-defined granuloma lesions composed of histiocytes. Yeast-like organisms were seen stuffed within the histiocytes as well as in the interstitial space. Grocott and PAS stain revealed the presence of single, centrally located transverse septum in some of the organisms. These Date: 12 July, 2000 Venue: Yaumatei S...

A 15-year-old male developed features of Still's disease. He was treated, with incomplete response, with aspirin and corticosteroids. Some 10 months after the onset he contracted chickenpox and became gravely ill. A diagnosis of histiocytic medullary reticulosis was made because erythrophagocytic histiocytes were detected in marrow aspirate films. Necropsy studies showed systemic infiltration b...

Bone marrow macrophages containing other cells, or large pieces of other cells, represent a distinctive feature of diseases such as Hemophagocytic Lymphohistiocytosis (HLH) and Rosai-Dorfman disease. We describe a distinct variation of phagocytic histiocyte morphology, featuring histiocytes containing predominantly fragments of neutrophil nuclei. We retrospectively reviewed initial bone marrow ...

Introduction Rosai-Dorfman disease (RDD) is a rare histiocytic proliferative disorder of unknown etiology. Usually it presents with massive painless cervical lymph node enlargement. Histologically, it shows proliferation of distinctive histiocytic cells that demonstrate emperipolesis in the background of a mixed inflammatory infiltrates. Immunohistochemically, the cells are positive for markers...

Sinus histiocytosis with massive lymphadenopathy is a non-neoplastic self-limiting disease of the bone marrow stem cell origin. It is characterized by painless, bilateral cervical lymphadenopathy accompanied by fever, leukocytosis, elevated erythrocyte sedimentation rate and hypergammaglobulinemia. Extranodal involvement including bone is rare. The patient is a 45-year -old female with multiple...

Progressive mucinous histiocytosis is a very rare, benign, non-Langerhans' cell histiocytosis limited to the skin. In total ten patients (all women) in four families and three sporadic cases have been reported. We report here the first published case of a male patient with progressive mucinous histiocytosis. The multiple red papules on the scalp and forearms were asymptomatic and had slowly inc...