Fig. 3

Microscopic appearance and immunophenotypes of the subcutaneous masses at the waist. (a): The lesion is restricted in the subcutaneous tissue and an intact lymph node infiltrated by crystal-laden histiocytes (the pink area), HE × 10. (b): Sheets of large polygonal and spindle histiocytes, HE × 400. (c): Needle-shaped crystals within the cells, HE × 1000. (d): CD68 × 400; (e): IgM × 1000; (f): IgG × 400