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KMID : 0363220190570010028
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Korean Journal of Dermatology
2019 Volume.57 No. 1 p.28 ~ p.31
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Proliferative Myositis on the Tongue
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Park Myeong-Jin
Seong Gi-Hyun
Park Min-Kee
Choi Mi-Soo
Hong Seung-Phil
Park Byung-Cheol
Kim Myung-Hwa
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Abstract
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Proliferative myositis is a rare, benign, probably pseudosarcomatous fibroblastic proliferation that typically presents as a rapidly growing soft tissue mass. Its relative rarity, fast growth rate, and unique histopathologic findings may lead to misdiagnosis as a malignant lesion and unnecessary radical surgical excision. A 57-year-old female presented with a non-tender, well-defined, indurated, solitary, hard papule on the median sulcus of the tongue for 2 weeks.
Histologic examination revealed numerous fibroblastic or myofibroblastic spindle cells and large ganglion-like cells infiltrating between and around the muscle fascicles. Immunohistochemical staining showed positivity for vimentin, smooth muscle actin, and CD68 and negativity for S-100. Based on these characteristic clinical findings and histopathologic features, the patient was diagnosed with proliferative myositis. Here, we report a rare case of proliferative myositis on the tongue and recommend considering proliferative myositis in the differential diagnosis when a physician encounters a rapidly grown soft tissue mass.
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KEYWORD
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Proliferative myositis, Pseudosarcoma, Tongue
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