It contained 40 ounces of atheromatous material.
"Anomalies and Curiosities of Medicine" by George M. Gould
The wall of the aneurism is atheromatous, or calcified; the middle coat may be atrophied.
"Special Report on Diseases of the Horse" by United States Department of Agriculture
This is the so-called atheromatous abscess.
"Arteriosclerosis and Hypertension:" by Louis Marshall Warfield