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Becker nevus syndrome refers to a rare disorder comprising the typical pigmented lesion and its associated developmental abnormalities. Becker nevus itself is typically localized on the upper trunk, scapular or upper arm unilaterally; however, it can occasionally occur as multiple or bilateral lesions on any parts of the body. In this report, a rare case of multiple Becker nevi arranged in a unique checkerboard-like pattern is presented. More uniquely, the associated abnormalities found in this patient, breast hypoplasia and leg lipodystrophy, seem to be regionally correlated with the nevi. In closing, we would like to raise an easy-to-remember 6B’s mnemonic, which stands for Becker, Breast, Bone, Bowen’s disease, Basal cell carcinoma, and Beta-actin, for the cases of Becker nevus syndrome.

Summary Introduction The association of Becker's nevus with other cutaneous, musculoskeletal or maxillofacial anomalies is called Becker nevus syndrome. Ipsilateral breast hypoplasia is the main reason for female patients to seek medical advice. We present two clinical cases of Becker nevus syndrome with thoracic nevus and ipsilateral breast hypoplasia treated with lipofilling alone (fat grafting). Material and methods For the two consecutive cases of Becker nevus syndrome treated by fat grafts, we present the surgical technique and the outcome at one year follow-up. Fat was harvested with cannula after infiltration. The adipose tissue was prepared with a short centrifugation. Fat grafting was realized as backward injections. Results We have noticed a concomitant improvement of the thoracic nevus color with a stable result after one-year follow-up. The aesthetic result after lipofilling was evaluated as very satisfying by the patient. The breast symmetry was improved. Conclusions We believe that the lipofilling technique is a natural and valuable treatment option for thoracic anomalies in Becker nevus syndrome with a major impact on patient's quality of life.

A síndrome do Nevo de Becker consiste na associação do nevo de Becker com hipoplasia mamária e outras alterações ósseas ou musculares ipsilaterais a lesão. È considerada desordem hormônio dependente causada pelo distúrbio na atividade do receptor de androgênios que parece estar aumentado no nevo de Becker podendo influenciar no desenvolvimento das lesões associadas. Apresentamos um caso relevante desta síndrome pela raridade da sistematização das lesões, além do exuberante acometimento extracutâneo neste caso.