[Microcephalic osteodysplastic primary dwarfism type II with hypergonadotropic hypogonadism in a 16-year-old patient].

Microcephalic osteodysplastic primary dwarfism type II (MOPDII) is a form of primordial nanism characterized by extreme short stature, microcephaly, specific phenotype, maxillofacial dysmorphisms, skeletal dysplasia, disorders of carbohydrate metabolism, and neurovascular abnormalities. This article describes a patient with a Seckel syndrome phenotype presenting with left internal carotid artery aneurysms with intracerebral hemorrhages, thrombocytosis, arterial hypertension, and diabetes mellitus due to insulin resistance confirmed by a low Matsuda index. Target carbohydrate metabolism values were achieved on metformin therapy. Clinical exome sequencing revealed two rare heterozygous variants in the PCNT gene: c.6220C>T (p.Gln2074*) and c.4564-12T>A. Comparison of the results of the molecular genetic study and the patient's phenotype allowed us to verify the diagnosis of MOPDII. Hypergonadotropic hypogonadism was described for the first time in this syndrome.