Histologic Features

At higher magnification, tumor in the small nodule had two different appearances.

A

B

Medium-sized cells in sheets

Smaller cells in sheets

Thin-walled vessels

Thin-walled vessels

Round to ovoid nuclei with finely-divided chromatin

Angulated, crowded, hyperchromatic nuclei

A

B

The mitotic rate was the same in both areas, about 5 per 10 high power fields. The arrows mark two mitoses in A. Tumor was found in lymphatics.

Clinical summary Image 4

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