Left Superior Vena Cavae | Revised Cannulation Plan | Absent Innominate Vein (1/6)

Whole-channel inclusion: Shankar Surgery is an honest teaching channel (title sample + 3 transcripts read: All sampled videos are genuine cardiothoracic surgical teaching clips with detailed clinical descriptions, consistent with the channel's educational purpose, despite missing transcripts for two samples.); this title passed a strict title check (sonnet) after a labelling pass.