Liquid biopsy for gastric cancer: Techniques, applications, and future directions

Figure 2 Main branches of cytology. A: Exfoliative cytology; the study of cells shed from body surfaces, collected either spontaneously or mechanically; B: Aspiration cytology; analysis of fluids obtained via fine-needle aspiration, from both superficial and deep tissues, with or without image-guided control. Image created by Tony Punk (contacto@tonypunk.es).