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| =Soft tissue lesions= | | =Soft tissue lesions= |
| | {{Main|Soft tissue lesions}} |
| The histomorphology can look very malignant when viewed through the context of adult [[soft tissue pathology]].<ref>{{Ref PCPBoD8|252}}</ref> | | The histomorphology can look very malignant when viewed through the context of adult [[soft tissue pathology]].<ref>{{Ref PCPBoD8|252}}</ref> |
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| ==Congenital infantile fibrosarcoma==
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| :Should not be confused with ''[[adult fibrosarcoma]]''.
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| ===General===
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| *Locally aggressive.
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| ===Microscopic===
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| Features:<ref name=pmid7839472>{{Cite journal | last1 = Corsi | first1 = A. | last2 = Boldrini | first2 = R. | last3 = Bosman | first3 = C. | title = Congenital-infantile fibrosarcoma: study of two cases and review of the literature. | journal = Tumori | volume = 80 | issue = 5 | pages = 392-400 | month = Oct | year = 1994 | doi = | PMID = 7839472 }}</ref>
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| *Spindle cell lesions.
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| ===Molecular===
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| Characteristic finding:<ref>{{Cite journal | last1 = Sheng | first1 = WQ. | last2 = Hisaoka | first2 = M. | last3 = Okamoto | first3 = S. | last4 = Tanaka | first4 = A. | last5 = Meis-Kindblom | first5 = JM. | last6 = Kindblom | first6 = LG. | last7 = Ishida | first7 = T. | last8 = Nojima | first8 = T. | last9 = Hashimoto | first9 = H. | title = Congenital-infantile fibrosarcoma. A clinicopathologic study of 10 cases and molecular detection of the ETV6-NTRK3 fusion transcripts using paraffin-embedded tissues. | journal = Am J Clin Pathol | volume = 115 | issue = 3 | pages = 348-55 | month = Mar | year = 2001 | doi = 10.1309/3H24-E7T7-V37G-AKKQ | PMID = 11242790 }}</ref>
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| *t(12;15)(p13;q25)
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| **Gene fusion ETV6-NTRK3.
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| =References= | | =References= |