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Fig. 2 | Diagnostic Pathology

Fig. 2

From: A dedifferentiated solitary fibrous tumor of the parotid gland: a case report with Cytopathologic findings and review of the literature

Fig. 2

a 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)

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