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Updated: Jul 10, 2026
Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
Published on: August 28, 2018
Pathology-validated prevalence and clinical characteristics of coronary medial arterial calcification
Yuki Matsumoto1, Sho Torii1, Kazuki Aihara1
1Department of Cardiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259-1193, Japan.
Insights
True coronary medial arterial calcification (MAC) is rare, with most imaging findings actually representing deep intimal calcification (DIC). Distinguishing these conditions is crucial for accurate diagnosis and patient care.
Area of Science:
- Cardiovascular Pathology
- Arterial Disease Research
- Histopathology
Background:
- Medial arterial calcification (MAC) is well-documented in peripheral arteries, but its prevalence and characteristics in the coronary arteries are not well-established.
- Deep intimal calcification (DIC) can mimic MAC on intravascular imaging due to its proximity to the internal elastic lamina (IEL), complicating diagnosis.
Purpose of the Study:
- To determine the pathology-validated prevalence of true coronary MAC.
- To morphologically characterize DIC as a potential mimic of coronary MAC.
- To differentiate between primary MAC and DIC in coronary arteries.
Main Methods:
- Analysis of 4508 histologic sections from 327 coronary arteries in 112 autopsy cases.
- Precise identification of the IEL and external elastic lamina using Movat Pentachrome and EVG stains.
- Evaluation of a high-risk cohort with 85% cardiac deaths.
Main Results:
- Pathology-confirmed coronary MAC was rare (1.0% of sections, 3.6% of patients).
- Two distinct MAC phenotypes were observed: secondary nodular protrusion (3 patients) and rare primary medial disease (1 patient).
- Deep intimal calcification (DIC) was significantly more prevalent, found in 35.7% of patients.
Conclusions:
- True primary coronary MAC is exceptionally rare.
- Clinical imaging findings of coronary 'MAC' predominantly represent DIC, not true medial calcification.
- Accurate interpretation of coronary artery imaging requires recognition of DIC, secondary nodular protrusions, and Mönckeberg-type MAC.
Aims:
Medial arterial calcification (MAC) is well characterized in peripheral arteries, but its pathology-validated prevalence in the coronary circulation remains uncertain. Because intravascular imaging cannot routinely delineate the elastic laminae in advanced atherosclerotic lesions, deep intimal calcification (DIC) accumulating adjacent to the internal elastic lamina (IEL) may fundamentally mimic MAC. This study aimed to determine the strict pathology-validated prevalence of true coronary MAC and morphologically characterize DIC as a potential imaging mimic using a large-scale autopsy registry.
Methods And Results:
We evaluated 4508 histologic sections from 327 coronary arteries in 112 autopsy cases. To ensure accurate layer-specific differentiation, the IEL and external elastic lamina were precisely identified using Movat Pentachrome and EVG stains. The cohort was high-risk, featuring 85% cardiac deaths. Pathology-confirmed MAC was remarkably rare, present in only 1.0% of sections and 3.6% of patients. Strikingly, coronary MAC presented in two distinct morphological phenotypes. Three patients exhibited nodular MAC strictly co-existing with intimal nodules in severely stenotic segments, representing secondary mechanical protrusion from the intima. Conversely, only one patient exhibited isolated medial sheet calcification with minimal intimal narrowing, representing true primary medial disease. Notably, the IEL-overriding pattern occasionally seen in peripheral MAC was entirely absent. Meanwhile, DIC was significantly more prevalent, identified in 35.7% of patients.
Conclusion:
True primary coronary MAC is exceptionally rare. Because dense acoustic shadowing clinically conceals secondary medial nodular protrusions in vivo, imaging-reported coronary 'MAC' almost exclusively represents DIC. Recognizing three distinct phenotypes-DIC, secondary nodular protrusion, and the rare true Mönckeberg-type MAC-is essential to accurately interpret clinical imaging findings.
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