Faecal Occult Blood Test

Case of the Month (Emma Scurrell April 2014)

Perineural invasion of a carcinoma in a dog

The following are H&E sections of incisional biopsies taken from a mass involving the prostate and encompassing the bladder neck in a 11-year-old, male Staffordshire bull terrier.



Fig 1. No normal tissue is present in these biopsy specimens. Sections consist of infiltrative nests of neoplastic epithelium that frequently surround and infiltrate nerve bundles.


 








Fig 2. No normal tissue is present in these biopsy specimens. Sections consist of infiltrative nests of neoplastic epithelium that frequently surround and infiltrate nerve bundles.

 

 




Final Diagnosis

Carcinoma associated with perineural invasion

Discussion

The morphology of the neoplastic infiltrate and the location of the tumour are most suggestive of a transitional cell carcinoma. Perineural invasion (PNI), also known as neurotropic carcinomatous spread, refers to the neoplastic invasion of nerves. It is recognised in the human literature as an important route of metastasis, in addition to lymphatic and haematogenous spread. It is most commonly reported in malignancies of the head and neck (particularly squamous cell carcinomas associated with intracranial extension along nerves), pancreas, large intestine, prostate, biliary tract and stomach.


Previous Monthly Cases

Hypertensive Retinopathy January 2010
FIP in a cat - uncommon presentation February 2010
Phaeohyphomycosis    March 2010 
Scleral Rupture April 2010
Canine and feline epulides May 2010
Erythema multiforme in a labrador retreiver June 2010
Keloidal fibrosarcoma in a labrador retreiver July 2010
Cutaneous epitheliotropic lymphoma  August 2010 
Benign cutaneous histiocytoma  September 2010 
Iridociliary adenoma October 2010
Proliferative thrombovascular necrosis of the pinnae November 2010
Signet-ring cell carcinoma in the stomach of a dog December 2010
Cutaneous infiltrative lipoma in a labrador January 2011

Tonsillar squamous cell carcinoma February 2011
Canine orbital meningioma March 2011
"Lung-digit" syndrome in a cat April 2011
Hepatic amyloidosis in a cat May 2011
Haemophagocytic histiocytic sarcoma June 2011
Alternaria spp. infection in an immunocompromised dog July 2011
Ocular manifestation of lymphoma in a cat  August 2011
Kerion dermatophytosis in a Cocker spaniel September 2011
Subcuticular coenurus in a rabbit  October 2011
Optic nerve glioma in a dog November 2011
Malignant transformation of a viral papilloma in a dog  December 2011
Uveodermatological syndrome in an Akita
January 2012
Cutaneous angiostomatosis in a dog  February 2012
Transitional cell carcinoma in a dog  March 2012
Corneal inclusion cysts in a dog   April 2012
Extraskeletal osteosarcoma in a dog  May 2012
Subungual melanoma in a dog  June 2012
Retrobulbar grass seed in a dog   July 2012
Lungworm infection associated with hypercalcaemia in a dog  August 2012
Conjunctival melanoma in a dog  September 2012
Pneumocystis infection in a Cavalier King Charles Spaniel  October 2012
Fungal keratitis and secondary endophthalmitis in a horse November 2012
Myeloid leukaemia with lymph node invasion in a dog    December 2012
Cutaneous toxoplasmosis in a cat   January 2013
Glomerulonephritis in a dog  February 2013
Splenic mast cell tumour in a cat  March 2013
Laryngeal rhabdomyoma in a dog  April 2013
Mycobacterial infection in an eye May 2013
Key Gaskell syndrome in a cat June 2013
Intraosseous epidermoid cyst in the toe of a dog July 2013
Septic Lens Implantation Syndrome August 2013
Fungal Keratitis in a dog September 2013
Fatal Cowpox Infection in a Cat
October 2013
Lingual granular cell tumour in a dog November 2013
Leydig cell tumour in a dog December 2013
Urticarial allergic reaction in a dog January 2014
Conjunctival foreign body in a dog  February 2014
An enlarged sublumbar lymph node in a hypercalcaemic dog  March 2014



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Faecal Occult Blood Test