Background Noonan syndrome is an autosomal dominant genetic disorder that can occur in men and women and has a sporadic or family history. NS can lead to abnormal bleeding, but cerebral haemorrhage is rare. This is the first case of cerebral haemorrhage with a RAF1 gene mutation that originated in the neonatal period. Case presentation This case presents a newborn with a RAF1 gene mutation resulting in NS complicated with an abnormality of chromosome 46, X, del (Y) (q12). In the course of treatment, the baby's breathing suddenly increased. After an MRI examination of the skull, haemorrhaging was found in multiple parts of the brain. Conclusions After symptomatic treatment, the baby recovered well, but the main cause of cerebral haemorrhage was not found.

The organic mol­ecule of the title compound, C18H14N4O2·H2O, lies on a center of inversion located at the centre of the central phenyl­ene ring. There are two half-molecules in the asymmetric unit. In the crystal, the mol­ecules are linked through by N—H⋯O and O—H⋯N hydrogen bonds involving the water mol­ecule, forming a layer structure. The layers inter­act by π–π inter­actions between the aromatic rings.