PMC8551767_01
Ulcerative pododermatitis caused by Anatrichosoma spp. was presented in four feet (A); 2 weeks post-treatment with emodepsine/praziquantel led to complete recovery (B).
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F1
Physical examination revealed ulceration and swelling of all feet, mainly on the hindlimbs (Figure 1A). The cat was treated with wound dressing and additional treatment with emodepsine/praziquantel (Profender  spot-on, Bayer); the skin lesions recovered within 3 days post-anthelmintic treatment and completely recovered after 2 weeks (Figure 1B).
Histopathological section stained with haematoxylin and eosin revealing necrosis in the epidermis and nematode-like lesions in the dermis (200 mum scale bar).
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F2
The cross-section of the nematode was noticed in the epidermis and dermis (Figure 2).
Histopathological section stained with haematoxylin and eosin revealing inflammatory cell infiltration (arrowheads) in dermis and egg (star) in the uterus of an adult female (25 mum scale bar).
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F3
Figure 3 shows inflammatory cell infiltration. The egg was oval, 30 x 55 mum in size, with a bi-operculate thick wall (Figure 3). Infiltration of mixed inflammatory cells including neutrophils, macrophages and eosinophils was noted at the dermis, accompanied by necrosis (Figure 3).
Maximum-likelihood phylogenetic tree showing the genetic relationship between Anatrichosoma spp. in cats (OK044796) (yellow dot) and other Trichinellida nematodes using 18S rRNA gene.
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F4
Trichinellida. The sequences were grouped into three clusters: Trichuris/Capillaria spp., Trichinella spp. and Anatrichosoma spp. (Figure 4).