Abstract：
:A 4-year-old captive ringed seal (Pusa hispida) was treated with subcutaneous antibacterial injections for pus exuding wounds in the skin and associated blubber following a bite attack. Three months after the incident, the animal presented nystagmus and died the following day. At necropsy, there was a 25 × 18 × 25 mm well-delineated, opaque nodular mass in the lung, besides the skin ulcers and localized areas of discoloration in the blubber correlating with the bite wound and injection sites. Histopathology of the pulmonary mass demonstrated severe eosinophilic inflammatory infiltration among numerous intralesional fungal hyphae. The hyphae were irregularly branched, broad and aseptate, consistent of zygomycosis. Magnetic resonance imaging was conducted on the head, which was initially frozen intact, revealing diffuse areas of hyperintensity in the cerebellum. Restricted histopathologic examination of the cerebellum showed severe granulomatous inflammation well spread within the neuroparenchyma, associated with abundant intralesional fungal hyphae similar to those appreciated in the pulmonary mass. Molecular analyses of the fungi in the pulmonary and cerebellar tissue identified the etiologic agent in both sites as Rhizomucor pusillus. The likely route of infection is through inhalation of R. pusillus spores or fragmented hyphae from the environment that developed into an initial pulmonary infection, becoming the source of hematogenous dissemination to the cerebellum. The skin and blubber lesions likely contributed to immunosuppression. Zygomycosis is uncommon in pinnipeds, and the present report emphasizes the importance of considering zygomycete dissemination even when the primary focus is highly confined.
journal_name
Mycopathologiajournal_title
Mycopathologiaauthors
Nakagun S,Okazaki M,Toyotome T,Sugiyama N,Watanabe K,Horiuchi N,Kobayashi Ydoi
10.1007/s11046-018-0268-3subject
Has Abstractpub_date
2018-12-01 00:00:00pages
979-985issue
6eissn
0301-486Xissn
1573-0832pii
10.1007/s11046-018-0268-3journal_volume
183pub_type
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