My father has a tumor in his right lung which led to post-obstructive pneumonia. This led to a tumor ablation and hospitalization. He is much improved, but we waited nearly two weeks to receive a pathology report that indicates high grade carcinoma with neuroendocrine differentiation that they believe to be highly aggressive. The surgeon has told us the pathologist can't be certain it's SCLC, but they believe they should proceed as if it were. My question is how can we proceed with confidence without certainty? Is this common in pathology of lung cancer?