House’s genius is shown, not told. When the MRI comes back clean, everyone assumes there is no tumor. House asks: "Did she have an MRI with contrast?" The answer is no. He demands a second MRI with gadolinium—and finds a lesion that was invisible on the first scan.
If you rewatch the pilot today, you'll notice it looks different from the rest of the series. Director Bryan Singer used a heavy orange hue lens house md season 1 ep 1 full
Patients hide the truth, which complicates diagnosis. House’s genius is shown, not told
“But I didn’t. And she’s alive. Which means I was right, and you’re welcome.” House’s genius is shown