Multicentric plasma cell variant of Castleman disease (CD) has rarely been reported and the optimal therapeutic approach is unknown, especially in childhood. In this case report, we discuss the case of a 7-year-old boy with multicentric plasma cell variant of CD, who presented with cervical lymphadenopathies, autoimmune hemolytic anemia, bone marrow insufficiency, pulmonary, renal, hepatic, and gastrointestinal involvement, emphasizing the difficulty in diagnosis and treatment approach.