Maria Frost

Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement For original data, please contact corresponding author. References 1, , , et al., “Review of Opsoclonus-Myoclonus Ataxia Syndrome in Pediatric Patients,” Children (Basel) 11 (2024): 367. 2, , , and , “Outcome and Prognostic Features in Opsoclonus-Myoclonus Syndrome From Infancy to Adult Life,” Pediatrics 128 (2011): e388–e394, https://doi.org/10.1542/peds.2010-3114.

CNS central nervous system dL deciliter DOL day of life EVD external ventricular drain To the Editor: Congenital systemic mastocytosis is a rare condition, typically presenting before 2 years of age and is characterized by abnormal mast cell infiltration and proliferation in several organs, especially in skin, bone marrow, liver spleen, and lymph nodes. Over 90% of patients harbor a somatic KIT D816V mutation, which leads to unchecked mast cell activation [1, 2].

AFP alpha fetoprotein aHSCR autologous hematopoietic stem cell rescue BEP bleomycin, etoposide, and cisplatin Beta-HCG beta-human chorionic gonadotropin CE carboplatin + etoposide GCT germ cell tumor GemDMC gemcitabine, docetaxel, melphalan, carboplatin GemOx gemcitabine and oxaliplatin HDCT high-dose chemotherapy ICE ifosfamide, carboplatin, and etoposide IPFSG International Prognostic Factor Study Group MDS myelodysplastic syndrome mIU milli international units mL milliliter ng nanograms OS...