A 7-year-old child presents with progressive weakness of the lower limbs and gait disturbance over 6 months. MRI of the spine shows an eccentric intramedullary lesion in the cervical cord with T2 hyperintensity and indistinct margins, as marked **A** in the diagram. The lesion demonstrates patchy heterogeneous enhancement and is associated with a rostral syrinx. Based on the imaging characteristics of the structure marked **A**, which of the following is the most likely diagnosis?
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