Faecal Occult Blood Test

Case of the Month (Emma Scurrell June 2014)

Sebaceous adenitis in a dog 

Skin biopsies have been taken from areas of scaling and crusting on the dorsal neck and trunk regions of a 2-year-old female poodle.









Fig 1.  There is a nodular dermal inflammatory infiltrate (arrow) that corresponds to the location of the sebaceous glands. In many of the sections however, the sebaceous glands are absent.



 








Fig 2.  The inflammatory infiltrate is dominated by macrophages mixed with fewer neutrophils. Rare remaining sebaceous gland cells are identified (delineated by oval outline).
 

Fig 3. There is orthokeratotic hyperkeratosis and follicular plugging that manifests clinically as increased scale and follicular casts.    




Final Diagnosis

Granulomatous sebaceous adenitis associated with sebaceous gland loss and hyperkeratosis


 Discussion

Sebaceous adenitis is an uncommon lesion in dogs of uncertain aetiology that results in keratinisation abnormalities. The strong breed predilection (e.g. Standard poodles, Akitas, Viszlas and German Shepherds) suggests a genetic basis. Clinically, dogs typically have poor coat quality associated with adherent scale and follicular casts. The lesion distribution is often bilaterally symmetrical but in some cases, the tail can be predominantly affected creating the appearance of a ‘rat tail’.

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
Perineural invasion of a carcinoma in a dog  April 2014
Intestinal pseudo-obstruction in a dog  May 2014



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Faecal Occult Blood Test