Horse with ulceration
A 9-year-old Arabian gelding was presented for a large ulcerated mass on the dorsal aspect of the pastern of the right forelimb. Radiographs showed no deep tissue involvement. Surgical removal was elected.
Granular material within mass
Histology revealed nematode larvae surrounded by necrotic cellular debris forming granulomata.
Case and photos kindly provided by NCVP Novartis resident Dr. Alice Lee, Cornell University.
This is a case of cutaneous habronemiasis, or "summer sores". This condition may result from the entry ofHabronema 3rd-stage larvae into an open wound (or mucous membrane) when several fly species feed. Larvae do not mature, but instead die in situ. The larvae deposited in wounds or at mucocutaneous junctions can cause proliferative lesions that grow and ulcerate throughout the fly season.
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