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(→SCC in situ, actinic keratosis: new section) |
(→PUS: new section) |
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Line 32: | Line 32: | ||
Actinic keratosis.<br> | Actinic keratosis.<br> | ||
Solar elastosis.<br> | Solar elastosis.<br> | ||
== PUS == | |||
===Microscopic=== | |||
The sections shows an atypical spindle cell lesions in the deep dermis, with a storiform and fascicular pattern, marked nuclear pleomorphism and very high mitotic activity (129 mitoses / 10 HPF, field diameter 0.55 mm). The spindle cells have moderate-to-abundant partially vaculated eosinophilic-to-amphophilic cytoplasm, ellipsoid-to-ovoid nuclei with coarse, irregular chromatin and, focally, nucleoli visible with the 10x objective. Malignant multinucleated-cells are identified focally with abundant pale gray cytoplasm. Suture material and reactive foreign body giant cells are seen. | |||
===Final diagnosis=== | |||
Forearm lesion, left, re-excision:<br> | |||
Pleomorphic undifferentiated sarcoma (malignant fibrous histiocytoma) with deep margin focally positive.<br> | |||
Dermal scar. |
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