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The authors present the clinical case of a 5-month-old boy, affected by multimalformative syndrome with features of microdeletion 3q syndrome. In the literature so far, the real incidence is unknown because of its rarity. The goal of this study was to describe the salient findings of this rare malformative syndrome, which needs a multidisciplinary approach. The patient had 3q interstitial chromosome deletion (q22.1-q25.2). He showed the following clinical features: microcephaly, microphthalmia, epicantus inversus, blepharophimosis, palpebral ptosis, short neck with pterygium, brachycephaly, round face, hypotelorism, broad nasal bridge, beaked nose, large and low-set ears, soft cleft palate, retromicrognathia with large mouth, arthrogryposis of the superior limbs and knees in association with clinodactyly, overlapping of second and third digits of both hands and feet, and gastroesophageal reflux. The patient developed physical and motor development delay. He was affected by Dandy-walker malformation, characterized by cerebellum vermis hypoplasia. The placement of the patient in contiguous gene syndrome (Dandy walker syndrome, Pierre-Robin sequence, and Seckel syndrome) was carried out by a multidisciplinary team to have a holistic evaluation of clinical findings. Thanks to this approach, it was possible to establish a complete diagnostic and therapeutic course. The genetic analysis enables to arrange an assistive program. Surgeons' attention was focused on the malformations, which represented an obstacle for normal development and social life.