Case: A 4-month-old male baby boy was referred to hospital for evaluation of his large-sized head. The initial clinical examination revealed facial dysmorphism including a prominent wide forehead, wide anterior fontanel, bushy eyebrows, synophrosis , small palpebral fissures, ocular hypertelorism, high arched palate, depressed nasal bridge, low-set ears, micrognathia, bilateral clenched hands with over lapping fingers, rocker-bottom feet and penile hypospadius . Imaging Studies: A computed tomography scan of the patient's head showed a dilatation of all the ventricular systems of the brain.

A chromosome analysis of his peripheral blood confirmed a trisomy of chromosome 18 (47, XX+18). What does the above-mentioned condition refer to in the baby? Source: jmjmedicalcase *This case is from Docplexus Editorial Team for educative purposes only