Background: Neonatal lupus erythematosus (NLE) is a disease associated with the transplacental transfer of maternal anti-Ro/SSA. The histopathologic characteristics of neonatal lupus have been described as compatible with cutaneous lupus based on isolated cases.
Methods: We retrospectively review the available literature and compare them with findings obtained in seven biopsies of five cases.
Results: Erythematous-desquamative lesions and urticaria-like lesions were observed in our series. Two cases showed both type of lesions. Vacuolar alterations at the dermoepidermal interface and adnexal structures were the histopathologic findings on erythematous-desquamative lesions, and a superficial and deep perivascular and periadnexal lymphocytic infiltrate was the major pattern in urticaria-like lesions. One case showed prevalence of eosinophils in the inflammatory infiltrate. Sixty cases have been reported previously. Sixty-five percent presented erythematous-desquamative and 29% urticaria-like lesions. Pathologic findings of erythematous-desquamative lesions were similar to those found in our series, but epidermal vacuolar changes were the predominant histopathologic finding in urticaria-like lesions of cases reported in the literature.
Conclusions: The majority of cases of NLE show vacuolar alteration at the dermoepidermal interface and adnexal structures. Some cases exhibit a superficial and deep perivascular and periadnexal lymphocytic infiltrate without epidermal alteration, and rare cases may have eosinophils in the infiltrate.