1. Objective To discuss clinical characteristics of gallbladder agenesis ( GBA ).

2. Conclusion Severe tooth agenesis will affect the development of mandible and maxillary bones.

3. Objective Discuss the presentation of congenital pulmonary agenesis or hypogenesis in adult with CT.

4. Mullerian agenesis is the second most common cause of primary amenorrhea after gonadal dysgenesis.

5. Subcortical heterotopia in 7,4 cases with callosal agenesis were accompanied.

6. Methods The clinical manifestations and MRI findings of 12 patients with callosal agenesis were analyzed retrospectively , in the meantime the relative literatures were reviewed.

7. Another diagnosis to consider is a closed spinal dysraphism, where the vertebral arches are not fused well, but there is no vertebral column agenesis.

8. We present a 18-year-old young lady with primary amenorrhea due to mullerian agenesis.

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9. It is a spectrum of abnormalities ranging in severity from mild hypogenesis to total lumbosacral agenesis.

10. Conclusion Most of the cases complicated with uterine duplication and cervix duplication and renal agenesis.

11. Conclusion MRI can directly observe the morphologic construction of the corpus callosum so that MRI should be a first choice in the diagnosis of callosal agenesis.

12. Objective To evaluate the value of MRI in the diagnosis of callosal agenesis.

13. Methods The data of 19 patients with congenital pulmonary agenesis or hypogenesis with CT were analyzed.

14. Cerebellar hypoplasia is not a sonographic feature of isolated agenesis of the corpus callosum.