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HOME > J Pathol Transl Med > Volume 41(4); 2007 > Article
Case Report Ki-1 Positive Extranodal NK/T Cell Lymphoma, Nasal Type, Mistaken as Dermatomyositis: A Case Report and Literature Review.
Hyun Jung Kim, Eunah Shin, Jung Yeon Kim, Kyeongmee Park, Young Jin Yoo, Seung Sook Lee
Journal of Pathology and Translational Medicine 2007;41(4):278-283
DOI: https://doi.org/
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1Department of Pathology, Inje University, Sanggye Paik Hospital, Seoul. hjkim@sanggyepaik.ac.kr
2Department of Oncology, Inje University, Sanggye Paik Hospital, Seoul.
3Department of Pathology, Korea Cancer Center Hospital, Seoul, Korea.

We report a case of a 38-year-old male with extranodal NK/T-cell lymphoma, nasal type, showing unusual clinical and pathological features. The patient was admitted for soft tissue swelling and tenderness in both legs. The patient had been treated intermittently 8 months prior for repeated muco-cutaneous ulcers. A muscle biopsy showed medium-sized atypical lymphoid cells with bizarre nuclei and plump cytoplasm, infiltrating to the skeletal muscle fibers with angiocentricity. The immunoresults were Ki-1+, CD56+, cytoplasmic CD3+, with EBV-in situ hybridization +. The patient rapidly deteriorated and died of sepsis and respiratory failure shortly after initiation of low-dose chemotherapy. A careful review of previous biopsies revealed scarce atypical lymphoid cells around vessels with similar immunoprofiles without the presence of Ki-1 positive cells. This case emphasizes that an extranodal NK/T-cell lymphoma may have a dermatomyositis-like diffuse presentation. Ki-1 co-expression can be an unexpected event in a process of the disease course; however, this should be validated with future studies.

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