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An 8-month-old calf showed progressive neurological signs following the use of a nose ring. Gross and histopathological examination revealed a large abscess in the pituitary gland accompanied by leptomeningitis, encephalitis, and plexus choroiditis.\n                    <jats:italic>Helcococcus ovis<\/jats:italic>\n                    was isolated from the pituitary abscess and identified by MALDI-TOF mass spectrometry with high confidence. Coccoid gram-positive bacteria were observed on gram stain of formalin-fixed tissues from leptomeningitis, plexus choroiditis and pituitary abscess lesions. Gross and histological features were indistinguishable from abscesses caused by other pyogenic organisms, highlighting the critical importance of bacteriological culture to diagnosis. This case expands the known pathogenic spectrum of\n                    <jats:italic>H. ovis<\/jats:italic>\n                    and suggests its inclusion in the differential diagnosis of suppurative central nervous system lesions in cattle.\n                  <\/jats:p>","DOI":"10.1007\/s11259-026-11171-x","type":"journal-article","created":{"date-parts":[[2026,3,21]],"date-time":"2026-03-21T05:53:49Z","timestamp":1774072429000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Pituitary abscess, plexus-choroiditis and encephalitis by Helcococcus ovis in a calf"],"prefix":"10.1007","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2954-8964","authenticated-orcid":false,"given":"Jean Carlo Olivo","family":"Menegatt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-1218-2909","authenticated-orcid":false,"given":"Ellen Cristina","family":"de Oliveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8317-7156","authenticated-orcid":false,"given":"Cassiane Elisabete","family":"Lopes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5186-2880","authenticated-orcid":false,"given":"Fernanda Felicetti","family":"Perosa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2063-9958","authenticated-orcid":false,"given":"Eduarda","family":"Keil","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-8525-7047","authenticated-orcid":false,"given":"Jeniffer Bomfim","family":"Carvalho","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-8801-8683","authenticated-orcid":false,"given":"Mariana Bandeira","family":"Casagrande","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3766-0654","authenticated-orcid":false,"given":"David","family":"Driemeier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,21]]},"reference":[{"key":"11171_CR1","doi-asserted-by":"publisher","first-page":"488","DOI":"10.1016\/j.vetmic.2010.11.012","volume":"149","author":"S Bilk","year":"2011","unstructured":"Bilk S, Nordhoff M, Schulze C, Wieler LH, Kutzer P (2011) Antimicrobial susceptibilities and occurrence of resistance genes in bovine Helcococcus ovis isolates. 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