Korean J Dermatol.  2022 Jul;60(6):395-399.

Rapidly Progressive Myxoinflammatory Fibroblastic Sarcoma with Sudden Onset Treated by Wide Excision: A Case with an Atypical Clinical Course

• Kwon HJ
• Yoo DW
• Ryu JH
• Choi JA
• Kim KH
• Yoon JH

Abstract

Myxoinflammatory fibroblastic sarcoma (MIFS) is a rare neoplasm that is frequently located in the distal extremities. Emerging evidence suggests that MIFS can also affect the proximal limbs, trunk, and scalp, and aggressive clinical courses have been noted. We report a case of MIFS that occurred suddenly in the patient’s forearm and grew rapidly within 2 weeks. A level of Ki-67 was observed in the patient’s lesion, which constitutes a considerable finding compared with most MIFS cases. The patient underwent surgical tumor removal, and no evidence of recurrence was noted. We highlight this case in view of its sudden occurrence and rapid local progression, which contradicts the usual features of this disease, suggesting that this clinical course might be attributable to the high Ki-67 value.

Keyword

Emperipolesis; Immunohistochemistry; Ki-67 antigen; Reed-Sternberg cells; Sarcoma