Agenesis of olfactory bulbs: A forgotten diagnostic indicator of acampomelic campomelic dysplasia

Campomelic dysplasia (CD) and its variant acampomelic campomelic dysplasia (ACD) are caused by SOX9 haploinsufficiency. This gene encodes a transcription factor crucial for embryogenesis and primarily expressed in the olfactory bulbs. The detection of agenesis of olfactory bulbs could help establish a prenatal diagnosis of CD or ACD, although prevalence of this sign remains unknown.

[Skull fracture or bipartite parietal bone]

We describe the case of a male newborn born at 37 weeks of gestation. Complete radiological assessment because of suspected skull fracture revealed the diagnosis of a bipartite parietal bone. A brief review of the literature shows the exceptional character of this anatomical variant, whose origin is unclear at the present time.