Congenital self-healing Langerhans cell histiocytosis (CSHLCH), a rare benign disorder, is initially seen at birth or in the newborn period. In 1973, Hashimoto and Pritzker first reported this disease 1 and since then more than 30 cases have been reported in Japan. CSHLCH is characterized by eruptions of multiple papules and nodules that resolve spontaneously without involvement of other organs. 1,2 Here we present a case of a neonate who was born with multiple skin erosions mimicking varicella and lung nodules that regressed spontaneously.
Case reportA female infant, who weighed 2980 g, was born by spontaneous vaginal delivery at 38 weeks' gestation to a healthy mother after an uncomplicated pregnancy. The mother had no contributory family history and was not a smoker. The infant was transferred to our hospital on the first day of life because of multiple skin erosions and vesicles that presented at birth. On examination at our hospital, her temperature was 36.4°C, her pulse rate was 140 b.p.m., her respiratory rate was 40 per minute, and her blood pressure was 69/38 mmHg. She had multiple cutaneous erosions and varicelliform vesicles of 5 to 10 mm in diameter, which were scattered over her whole body including her scalp (Fig. 1). The mucomembranous surface, lymph nodes, and liver were not involved. Complete blood cell count and blood chemistry results were as follows: white blood cells, 17.8 ¥ 10 9 /L with 73% segmented neutrophils, 21% lymphocytes, and 6% monocytes; red blood cells, 4.89 ¥ 10 12 /L; hemoglobin, 17.9 g/dL; hematocrit, 54.6%; platelets, 353 ¥ 10 9 /L; lactic dehydrogenase, 541 IU/L; aspartate aminotransferase, 48 IU/L; and alanine aminotransferase, 16 IU/L. Chest X-ray showed no lesions in either lung. A lumbar puncture was performed, and an examination of the cerebrospinal fluid was normal. The patient was suspected to have congenital herpes simplex virus (HSV) or varicella-zoster virus (VZV) infections.However, direct immunofluorescence assays from basal membrane of vesicles for HSV and VZV were negative. Serological studies were also negative on both HSV and VZV. She was treated with acyclovir for a week until HSV and VZV were ruled out. On the 19th day after birth, histopathological cutaneous examination of her back lesion was performed. It revealed numerous mononuclear cells with kidney-shaped nuclei. Immunochemistry analysis showed that cells were positive for CD1a and S-100 protein: both were characteristic of Langerhans cells. Electron microscopic examination revealed Birbeck granules in the infiltrating cells (Fig. 2), but laminated dense bodies were not found in the same cells. The skin lesions soon regressed with incrustation, and completely disappeared spontaneously within a month (Fig. 1). Therefore, we diagnosed this case as congenital self-healing Fig. 1 Multiple cutaneous erosions and varicelliform vesicles were scattered over the whole body (day 0). By day 16 they had almost disappeared spontaneously.