Relevance: M6 variant of acute myeloid leukemia is extremely rare in pediatric practice. The diverse clinical manifestations of erythroid leukemia complicate the timely diagnosis of this group of diseases. Purpose: to describe a clinical case of congenital erythroid leukemia with multiple lesions of soft tissues and the skeletal system with complications in the form of the convulsive disorder, presented as a tumor of the Ewing’s sarcoma family, diagnosed at the Research Center of Pediatrics and Pediatric Surgery (Almaty, the Republic of Kazakhstan). Results: The presented clinical case demonstrated challenges in diagnosing and treating young patients with multiple life-threatening tumor lesions. The need to develop molecular genetic studies and expand diagnostic capabilities is an integral part of treating oncohematological diseases. Conclusion: The presented clinical case is of great interest due to its rareness. This case confirms the need to conduct all diagnostic manipulations to assess the process prevalence and choose and conduct molecular genetic studies on all examination and treatment stages.

Relevance: M6 variant of acute myeloid leukemia is extremely rare in pediatric practice. The diverse clinical manifestations of erythroblastic leukemia complicate the timely diagnosis of this group of diseases. Purpose: to describe a clinical case of congenital erythroblastic leukemia with multiple lesions of soft tissues and the skeletal system with complications in the form of the convulsive syndrome, presented as an Ewing’s sarcoma tumor, diagnosed at the Research Center of Pediatrics and Pediatric Surgery (Almaty, the Republic of Kazakhstan). Results: The presented clinical case demonstrated challenges in diagnosing and treating young patients with multiple life-threatening tumor lesions. The need to develop molecular genetic studies and expand diagnostic capabilities is an integral part of treating oncohematological diseases. Conclusion: The presented clinical case is of great interest due to its rareness. This case confirms the need to conduct all diagnostic manipulations to assess the process prevalence and to choose and conduct molecular genetic studies on all stages of examination and treatment.