Key result
CCTA identifies a benign congenital LMCA ostial band, distinguishing it from dissection.
Why the study?
Ostial bands of the left main coronary artery are exceedingly rare congenital variants that may closely mimic a focal dissection flap on imaging.
Case Report (n=1)
High-resolution coronary CT angiography can accurately characterize rare congenital ostial bands of the left main coronary artery, preventing misdiagnosis as a focal dissection flap or atherosclerotic lesion.
Answers are grounded in this paper and cite their sources.
Awareness of congenital ostial bands on coronary CT angiography may avert misdiagnosis as dissection; case reports leave open prevalence and significance.
We report an incidental ostial band of the left main coronary artery (LMCA), identified on coronary computed tomography angiography. A thin, linear, noncalcified band was noted within the left coronary sinus, adjacent to the LMCA ostium, confirmed on multiplanar and virtual dissection images, with no associated luminal narrowing. Such bands are exceedingly rare congenital variants, distinct from ostial ridges or atherosclerotic lesions, and may closely mimic a focal dissection flap. This case highlights the importance of recognizing this subtle entity and the value of high-resolution noninvasive imaging in its accurate characterization.
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Ojha et al. (2026) conducted a case report in Incidental ostial band of the left main coronary artery (LMCA) (n=1). Coronary computed tomography angiography (CCTA) was evaluated. Coronary CT angiography identified an incidental, thin, noncalcified congenital ostial band of the left main coronary artery with no luminal narrowing in 1 patient, distinguishing it from dissection.
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