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Loss of histone 3 lysine 27 trimethylation (H3K27me3) has been described as a diagnostic marker for malignant peripheral nerve sheath tumor (MPNST), also discriminating MPNST with rhabdomyoblastic differentiation (malignant Triton tumor) from rhabdomyosarcoma (RMS). We studied the immunohistochemical expression of H3K27me3 in embryonal RMSs (ERMSs), performed methylation profiling in order to support the diagnosis and RNA-sequencing for comparison of the transcriptome of H3K27me3-positive and -negative cases. Of the 25 ERMS patients, 17 were males and 8 were females with an age range from 1 to 67 years (median, 6 years). None were known with neurofibromatosis type 1. One patient had Li-Fraumeni syndrome. Tumor localization included paratesticular (n = 9), genitourinary (n = 6), head/neck (n = 5), retroperitoneal (n = 4) and lower arm (n = 1). Five MPNSTs served as reference group. All ERMS had classical features including a variable spindle cell component. Immunohistochemical loss (partial or complete) of H3K27me3 was detected in 18/25 cases (72%). Based on methylation profiling, 22/22 cases were classified as ERMS. Using RNA sequencing, the ERMS group (n = 14) had a distinct gene expression profile in contrast to MPNSTs, confirming that the H3K27me3 negative ERMS cases do not represent malignant Triton tumors. When comparing H3K27me3-negative and -positive ERMSs, gene set enrichment analysis revealed differential expression of genes related to histone acetylation and normal muscle function with H3K27me3 negative ERMSs being associated with acetylation. Conclusion: Loss of H3K27me3 frequently occurs in ERMSs and correlates with H3K27 acetylation. H3K27me3 is not a suitable marker to differentiate ERMS (with spindle cell features) from malignant Triton tumor.

Background Perinatally chikungunya infected neonates have been reported to have high rates of post-infection neurologic sequelae, mainly cognitive problems. In older children and adults chikungunya does not appear to have sequelae, but data on postnatally infected infants are lacking. Methods We performed a prospective, non-controlled, observational study of infants infected before the age of 6 months with a severe chikungunya infection during the 2014–2015 epidemic in Curaçao, Dutch Antilles. Two years post-infection cognitive and motor - (BSID-III) and social emotional assessments (ITSEA) were performed. Results Of twenty-two infected infants, two died and two were lost to follow up. Eighteen children were seen at follow-up and included in the current study. Of these, 13 (72%) had abnormal scores on the BSID-III (cognitive/motor) or ITSEA. Conclusion In the first study aimed at postnatally infected infants, using an uncontrolled design, we observed a very high percentage of developmental problems. Further studies are needed to assess causality, however until these data are available preventive measure during outbreaks should also include young infants. Those that have been infected in early infancy should receive follow up.

Burns are common in children but it is not always clear whether the burn is accidental or not. Child abuse should always be considered. We present two children in which the diagnosis only became clear after admission and further investigation. Patient A, a 15-month-old boy, had a burn on his left shoulder. The burn was assumed suspect in view of the unclear history given by the parents and a possible delay in their seeking help. The patient was ultimately diagnosed with impetigo bullosa and successfully treated with antibiotics. Patient B, a 24-month-old girl, had burns on both feet and her right hand, which were infected as a result of the delay in seeking help. The burns were identified as abuse-related. The child was removed from her mother's care and sent to a foster home. A well-defined work-up should be followed in case of burns in children.

Juvenile spring eruption is an idiopathic photodermatosis which predominantly occurs in boys aged 5-12 years-old who have short hair and bat ears. In the Netherlands, this condition has only been described once previously but it is probably under-reported.A 1.5 year-old boy presented with papules on his ears which had been severely itching for 2 days. He had spent a considerable time outside in the spring sunshine. The itching was treated with a local class 1 glucocorticoid, after which the symptoms disappeared. The skin eruptions healed without leaving a scar. His 4-year-old brother also had papules on both ears for 1 week after being exposed to the sun, but did not experience any itching. After 3 weeks the skin eruptions disappeared leaving no scars.Both children had juvenile spring eruption. Itching can usually be treated locally with class 1 glucocorticoids. The condition disappears on its own.