Fig. 2From: A dedifferentiated solitary fibrous tumor of the parotid gland: a case report with Cytopathologic findings and review of the literaturea Dedifferetiaetd component (left) separated by fibrous septa, with abrupt transition to conventional solitary fibrous tumor (right) (Haematoxylin and eosin stain, 100x). b Low-grade area showing spindle cell morphology with sclerotic stroma (Haematoxylin and eosin stain, 400x). c Dedifferentiated area exhibiting poorly differentiated epithelioid morphology. Inset shows atypical mitotic figure (Haematoxylin and eosin stain, 400x). d Angiolymphatic permeation of pleomorphic tumor cells within fibrous septa (Haematoxylin and eosin stain, 400x). e Positive immunohistochemical staining for STAT-6 in both dedifferentiated and convention SFT areas. f Strong nuclear staining of ERG in anaplastic epitheloid cells (upper half); attenuatedor absent expression in peripheral spindle cells (lower half)Back to article page