Figure 2 Periodic acid-Schiff-stained tissue sample of an embolised artery (A) containing sections of a female Dirofilaria repens (U, uterus) with its multilayered cuticle (C) and external longitudinal cuticular ridges (LCR), longitudinal muscles (LM) and gut (G). The nematode is surrounded by a granulomatous reaction (GR). Magnification ×10; inlay ×40.