Tonsilloid cysts are the most common gill abnormalities, they account for 6.1 to 85.2% of the anomalies in the second slot. They are due to the persistence of the cervical sinus during the differentiation of the branching apparatus. The usual seat is the middle third of the anterior edge of the sternocleido-mastoid muscle but they can be located at any point from the average constrictor muscle of the pharynx to the above-clavicular region. We report in this work the clinical observation of a 6-year-old child who consulted for a left laterercervical swelling evolving for 2 months without associated signs, good general condition.the patient was stable on the hemodynamic and respiratory level in which the presence of a latero cervical left, non-inflammatory, painless firm fixed in relation to the superficial and deep plane, non-pulsatile. The etiological check-up was supplemented by imaging, the patient benefited from an exploratory cervicotomia with a resection of the entire cyst and sending the piece to the anatomopathological study. the histological diagnosis retained was a tonsilloid cyst with no signs of malignancy. Through our work we emphasize the value of therapeutic management as early as possible to limit the risk of inflammatory changes.