Unexpected Cause of Persistent Microcytosis and Neurological Symptoms in a Child: Niemann-Pick Disease Type C.

Atypical microcytic anemias are rare diseases of iron/heme metabolism that can be diagnostically challenging. We report the case of a 2-year-old twin boy with neurodevelopmental delay and persistent microcytosis in whom atypical microcytic anemias was initially suspected. He had low blood iron and transferrin saturation with normal/high ferritin despite iron therapy. Hemoglobinopathies were excluded by conventional/DNA studies. Hepcidin was high but iron-refractory-iron-deficiency anemia was ruled out by a genetic panel. Bone marrow aspiration revealed foamy cells and iron depletion. A genetic study confirmed the diagnosis of Niemann-Pick disease type C which was finally considered the origin of microcytosis through anemia of chronic disease.