Autopsy findings. (A) Macroscopic autopsy findings. The tumor occupied almost all of the left thoracic cavity; inside of the mass was abundant hemorrhage (asterisk), which was thought to reflect the low-density area seen in the CE-CT. (B) Microscopic autopsy findings. The solid tumor tissue in the left lung consisted of disarrayed malignant spindle cells surrounded by myxoid interstitial tissue with propagated collagen fiber (hematoxylin and eosin staining ×100). (C) Immunohistochemical staining (×200) shows Ki67+ malignant cells (index 50%). An Autopsy Case of Rapidly Progressing Spindle Cell Carcinoma of the Lung Accompanied with Intratumor Hemorrhage. Kida J, Kanaji N, Kishi S, Imaida K, Bandoh S - The American journal of case reports (2015). Not Altered. CC.