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Extrapleural cervico-manubriotomy and clavicular swing for the management of a mesenchymal tumour of the middle scalenus: an adapted anterior thoracic inlet approach.

Surgical approach for resection of tumours involving the thoracic inlet has largely been developed in the context of lung cancer of the superior sulcus. Therefore, initial anterior approaches included a thoracotomy associated with a longitudinal cervicotomy. Here, we describe a variation of the previously described anterior surgical approaches of the thoracic inlet that we performed for the resection of a primary mesenchymal tumour of the left middle scalenus muscle secreting fibroblast growth factor-23 responsible for tumour-induced osteomalacia. This approach allowed a safe control of the great vessels phrenic nerve and brachial plexus as well as a comfortable access to the middle scalenus muscle through an L-shaped incision with a cervico-manubriotomy without thoracotomy. The tumour was resected entirely with the middle scalenus. After 3 months of follow-up, the symptoms resolved entirely.