Fig. 4.

a) Microscopic examination of undifferentiated sarcoma. The neoplastic cells were arranged in an irregular pattern. Haematoxylin and eosin stain, original magnification 100×. b) Sarcoma characterized by neoplastic cells with atypia, eosinophilic cytoplasm and unclear cell border, some with prominent eosinophilic nucleoli. Haematoxylin and eosin stain, original magnification 400×. c) Interstitial collagen fibres (green) separated neoplastic cells were very scant. Masson’s trichome stain, original magnification 200×