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Lett."],"published-print":{"date-parts":[[2026,1,1]]},"abstract":"<jats:p>Miniaturization is crucial for translating photoacoustic (PA) endomicroscopy (PAE) into luminal environments that are beyond the reach of conventional endoscopes. Existing PAE probes rely on discrete optical components, which not only constrain further miniaturization but also suffer from assembly complexity and inconsistent optical performance. Here, we present a 1.4-mm-diameter PAE catheter based on astigmatism-corrected (AC) lensed fiber (LF), integrating optical focusing and acoustic detection in a compact capsule. It achieves 28\u2009\u03bcm lateral and 19\u2009\u03bcm longitudinal resolution at a 1.1\u2009mm working distance (WD), enabling three-dimensional (3D) microvascular imaging in multiple small luminal organs of live mice. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}