CD56＋皮肤淋巴瘤二例

例1，女，15岁。皮肤反复红肿、水疱、溃疡3年，浸润性斑块和结节6个月。组织学检查示真皮全层中等大小不典型淋巴样细胞呈血管中心性浸润，浸润细胞为LCA+，CD45RO+，CD56+，EBV+。最后诊断：鼻型结外NK/T细胞淋巴瘤。患者确诊后经系统化疗无效，1个月后死亡。例2，男，44岁。右腰部浸润性肿块进行性增大1年，局部淋巴结肿大4个月。组织学特征为真皮全层及皮下大量致密的中等至较大的母化淋巴样细胞浸润，浸润细胞对CD4+和CD56呈弥漫性阳性反应。最后诊断：母细胞性NK细胞淋巴瘤。患者行皮损切除后系统化疗，在随访中。CD56+皮肤淋巴增生性疾病常具有较高的侵袭性生物学行为。

Two cases of CD56 positive cutaneous lymphoma

In the first case, a 15-year-old girl presented with recurrent multiple erythematous edema, bullae and ulceration on the face and extremities for 3 years, which had developed into plaques and nodules on the face and trunk for 6 months. Histology revealed angiocentric and angiodestructive infiltrates with medium-sized atypical lymphoid cells positive for LCA, CD45RO, CD56 and EBV staining throughout the dermis. The patient was diagnosed with extra NK/T-cell lymphoma, nasal-type. She subsequently had a rapid downhill clinical course with resistance to systemic chemotherapy, and died one month later. In the second case, a 44-year-old male was admitted to the hospital with progressive infiltrated mass on the right waist for 1 year, and a 4-month-history of lymphadenectasis. Histologically, there was a massive and dense infiltrate with middle and large-sized, CD4 and CD56-positive lymphoblastics throughout the dermis and subcutaneous tissue. A diagnosis of blastic NK-cell lymphoma was made. The patient was managed with surgical excision followed by systemic chemotherapy. He had been followed up and free of relapse till the time of this writing. CD56 positive cutaneous lymphoproliferative disorders appear to be highly invasive.