We describe a case of an extremely rare intrathoracic supradiaphragmatic accessory liver tissue that was excised via transdiaphragmatic uniportal video-assisted thoracoscopic surgery. The intrathoracic mass that was radiologically detected was found to be mimicking a pleural tumour because of its supradiaphragmatic location as well as the presence of a clear cleavage plane separating the mass and the liver completely. This, to our knowledge, is the first described case that was resected via transdiaphragmatic uniportal approach in the literature.
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