Juvenile and adult xanthogranuloma. A histological and immunohistochemical comparison.
Thirteen cases of juvenile xanthogranuloma (JXG) and 13 cases of adult-type xanthogranuloma (AXG) were compared at the light and immunohistochemical levels. Histologically, four main cell types (vacuolated, xanthomatized, spindle-shaped, and "oncocytic") were seen in variable proportions (from monomorphous to mixed variants) with different types of giant cells (nonspecific, foreign body, Touton, and "ground-glass"). Giant cells were more prominent in AXG than in JXG; oncocytic cells (characterized by an eosinophilic, slightly granular cytoplasm similar to thyroid oncocytic cells) and mostly periodic acid-Schiff (PAS) negative giant cells with a ground-glass appearance (6 of 26) were not observed in classic JXG (i.e., occurring in children < 2 years old). Immunohistochemically, JXG and AXG gave similar results: most xanthogranuloma cells labeled strongly with KiM1P and vimentin, while HHF35 and HAM56 stained less intensively. Factor-XIIIa (FXIIIa), KP1 (CD68), and HAM56 stained mostly in the periphery of the lesions. Some markers gave variable results: peanut agglutinin (PA), 60%; alpha-1-antitrypsin, 50%; lysozyme, 25%; LN3 (HLA-DR), < 10% of cells positive. Others were negative: S-100, MAC387 (L1 antigen), LeuM1 (CD15), desmin, smooth muscle-specific actin, and QBEND10 (CD34). This profile helps to delineate xanthogranuloma from histological stimulants such as dermatofibroma (which is FXIIIa+, LN3+, KP1-, and PA-) and multicentric reticulohistiocytosis (which is FXIIIa-, KP1+, PA-, and HHF35-).
Zelger
B
B
Department of Histopathology, St. John's Dermatology Centre, London, United Kingdom.
Cerio
R
R
Orchard
G
G
Wilson-Jones
E
E
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006099:Granuloma / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D007223:Infant; D008297:Male; D008875:Middle Aged; D014972:Xanthogranuloma, Juvenile / Q000473:pathology*; D014973:Xanthomatosis / Q000473:pathology*