Figure 3
(a) Typical villous pattern (case 3). (b) Pseudoalveolar spaces with scattered osteoclast-like multinucleated giant cells (case 1). (c) Rounded or polygonal histiocyte-like mononuclear cells with eosinophilic cytoplasm (case 1). (d) Large-sized mononuclear histiocyte-like cells contain a peripheral rim of hemosiderin granules (case 2). (e) Iron stain discloses abundant hemosiderin (case 2). (f) Nodules of pink chondroid matrix are present between a proliferation of mononuclear histiocyte-like cells (case 1). (g) Lobular arrangement of hyaline cartilaginous tissue with mildly atypical chondrocytes (case 3). (h) Lace-like calcification between the mononuclear cells in the chondroid area (case 1). (i) Prominent enchondral ossification (case 3).
