Cornell's Peruvian Weaver - Anemia and Her Skull

The image to the right shows an x-ray of a transverse section of her skull. The inner and outer tables of her skull (the bright white layers) are widely separated, with streaky lines going between the two layers. Normally these tables are quite close together because, in the normal adult, the skull's marrow no longer has to make new red blood cells, so the marrow space does not have to be large. The large separation between the skull tables, with streaky lines of bone connecting the two tables, is the typical skull change seen in anemia: the separation is caused by an increase in the size of the bone marrow, which is trying to make enough new red blood cells to reduce anemia.

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