Fig. 8From: Advances in photoacoustic imaging aided by nano contrast agents: special focus on role of lymphatic system imaging for cancer theranosticsSchematic illustration of the principal routes of lymphatic metastasis and roles of lymphatic vessels in tumor progression. The figure was reused from the review article published in Medicinal Research Review by Rezzola, Halin, Ronca and co-workers in 2020 [148]Back to article page