Paediatric Imaging

Os incae

normal radiological variant of a separate interparietal bone in the skull which is of no clinical significance. The name is derived from the frequent finding of this bone in Peruvian mummies. The inca bone is bounded laterally by the lambdoid sutures and inferiorly by a transverse suture joining the right and left mendosal sutures. Normal variation in suture pattern gives the inca bone a variable appearance it may be triangular, rectangular (Fig.1), diamond-shaped or M-shaped. Rarely there may be a persistent superior median fissure running vertically and dividing the bone into two to give it a bifid appearance occasionally it may be seen as two separate laterally placed bones.

GL

To view high resolution images,
please register first.

Click  here to register.

Already registered? Enter your e-mail in the window below.
Re-register

Fig.1

There is a rectangular-shaped os incae at the junction of the sagittal and lambdoid sutures.
Os incae, Fig.1