Macular choroidal macrovessel (MCM) is a recently reported rare choroidal vascular abnormality, characterized by a distinctly thickened choroidal vessel extending from the macular area to the temporal periphery area in fundus examinations. MCM may be an abnormal dilatation of the posterior ciliary artery. The diagnosis of MCM relies on multimodal imaging examinations, with indocyanine green angiography and optical coherence tomography being particularly critical, while optical coherence tomography angiography serves as an essential supplementary and non-invasive alternative. Due to its rarity, ophthalmologists generally have limited awareness of MCM. In clinical practice, it is essential to be familiar with the clinical manifestations and imaging characteristics of MCM, to improve diagnostic levels, enhance differentiation capabilities, and minimize the occurrence of misdiagnosis.

Macular choroidal macrovessel (MCM) is a recently reported rare choroidal vascular abnormality, characterized by a distinctly thickened choroidal vessel extending from the macular area to the temporal periphery area in fundus examinations. MCM may be an abnormal dilatation of the posterior ciliary artery. The diagnosis of MCM relies on multimodal imaging examinations, with indocyanine green angiography and optical coherence tomography being particularly critical, while optical coherence tomography angiography serves as an essential supplementary and non-invasive alternative. Due to its rarity, ophthalmologists generally have limited awareness of MCM. In clinical practice, it is essential to be familiar with the clinical manifestations and imaging characteristics of MCM, to improve diagnostic levels, enhance differentiation capabilities, and minimize the occurrence of misdiagnosis.