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01/10/2012 | Head (porcine)
7

The pig with a giant ear

Inspectors included neoplastic or inflammatory lesions in the differential.

Histopathological examination helped rule out a diagnosis of neoplasia. It consisted of a dense fibrous tissue proliferation, well structured and vascularized along with the presence of a few mononuclear inflammatory cells around blood vessels.

It is a chronic inflammatory reaction most probably caused by trauma. Similar reactions have been described secondary to trampling or piercing the ears to identify animals with an ear tag.

Mass in the pinna, note the normal looks of the contralateral one.

Internal facet of the pinna.

When sectioned, the mass shows a witish edematous surface.

The lesion consisted mainly on mature fibrous tissue, well differentiated and well vascularized.

The lesion consisted mainly on mature fibrous tissue, well differentiated and well vascularized.

Scarce isolated pyogranulomatous inflammatory foci were identified, but no asteroid bodies nor accumulations of bacteria were observed in any case.

Scarce isolated pyogranulomatous inflammatory foci were identified, but no asteroid bodies nor accumulations of bacteria were observed in any case.



7 comment(s)


  1. Raul Fajardo
    09/01/2024

    The macroscopic edematous and gelatinous appearance and histopathological characteristics correspond to exuberant granulation tissue.

  2. Brad Njaa
    23/08/2016

    I am VERY interested in getting high quality images of this to include in a future edition of Zachary’s Pathologic Basis of Veterinary Disease. I have not seen this other than in photos and the ones on this website a great, including the H&E images. Any possibility you could share an H&E recut for future chapter version with inclusion of source in the figure legend?
    Thanks,
    BNjaa

    1. SESC
      25/08/2016

      Thanks for reading our blog Brad! We will contact you through e-mail to send you the files.

  3. SESC
    06/05/2014

    Comment from our LInkedIn group:

    By Yves Robinson
    Veterinary pathologist chez Canadian Food Inspection Agency

    Have seen a few similar cases over the years in market hogs. In one of these cases of perichondritis of the ear we found few pyogranulomas with Gram positive cocci. Very interesting.

  4. SESC
    27/12/2012

    Thank you for the interesting discussion.

    We have added a couple of histopathological images of the lesion. The lesion mainly consisted of mature, well differentiated, connective tissue. No neoplastic proliferation could be identified.
    As for the inflammatory findings, scarce and isolated pyogranulomatous foci were identified but no asteroid bodies or Splendore Hoeppli phenomena were observed, nor accumulations of bacteria.

  5. Pall Leifsson
    29/11/2012

    I am pretty sure that this is the right answer: This is a case of auricular elephantiasis caused by Staphylococcus aureus. Histologically pyogranulomatous inflammation (botryomycosis) can be found. The condition is rather common in Danish finisher pigs.
    Further reading: Kvist et al. (2002): Evaluation of the pathology, pathogenesis and aetiology of auricular elephantiasis in slaughter pigs. JOURNAL OF VETERINARY MEDICINE SERIES A-PHYSIOLOGY PATHOLOGY CLINICAL MEDICINE Volume: 49 Issue: 10 Pages: 517-522.

  6. SESC
    13/11/2012

    A traves de Google reader hemos recibido este comentario:

    Saludos, la imagen macroscópica, a mi parecer no sugiere una reacción inflamatoria ni aguda ni crónica, pues en el primer caso habría congestión y el tejido estaría ruborizado, con posibles hemorragias, edema, etc. En el segundo caso (inflamación crónica), si existiese fibrosis, el tejido estaría mas compacto, indurado y no tendría ese aspecto edematoso o mucinoso. Yo, particularmente creo que puede tratarse de una neoplasia mesenquimal, tal como mixoma/mixosarcoma o algún Schwannoma.

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