spondylometaphyseal dysplasia, Sedaghatian type (Monarch Disease Ontology entry MONDO_0009593) can be described as follows. Spondylometaphyseal dysplasia (SEMD), Sedaghatian type is a neonatal lethal form of spondylometaphyseal dysplasia characterized by severe metaphyseal chondrodysplasia, mild rhizomelic shortness of the upper limbs, and mild platyspondyly.