Figure 1

CT and MRI findings of the pig skull in case 1 (A–G) and case 2 (H–N).Three-dimensional volume reconstruction is shown in A (case 1) and H (case 2). The MRI of the pig’s skull is shown in B, F, G, I, M, L and N. The imaging of the pig skull is shown in C, D, E, K, L, and M. B, The size of the swelling on the median sagittal plane on MRI was 18.49 × 10.59 (L × H, mm). C and J, Imaging of three-dimensional volume reconstruction of the pig skull defect, specifically a canal with irregular edges. D, Transverse-plane section through the skull showing the bone defect in case 1. The length of the defect was 4.78 mm, and a cyst containing matter of fluid density was apparent. E and F, The matter in the swelling was related to the cerebral ventricle. G, The size of the swelling on the cross-section was 10.67 × 16.31 (L × H, mm). I and L, Transverse-plane section through the skull showing the bone defect in case 2. The herniation of the brain tissues from the median sagittal plane to the skull defect was apparent. Posterior displacement of the cerebellum due to increased intracranial pressure was evident. The size of the swelling was 17.24 × 12.92 (L × H, mm). The transverse cross-section of case 2. The length of the defect was 20.62 mm. A swelling with matter of liquid density was apparent. Transverse cross-section of case 2 on MRI. A swelling with T2 high/T1 low signals was apparent. The size of the protruding swelling was 11.66 × 11.38 (L × H, mm).