Male External Genitalia - Pathology
Pathology of external genitalia
Congenital abnormalities of the penis
- Absence of penis:usually seen only as part of a major whole-body malformation.
- Micropenis:seen in bulls (malformation of sigmoid flexure). Also some dogs.
- Persistent penile frenulum:bulls and dogs. Associated with cork screw or deviation of penis.
Congenital abnormalities of the prepuce
- Absence or agenesis:may be associated with pseudo-hermaphroditism.
- Absence of preputial orifice:seen in pups.
- Phimosis:small preputial orifice, penis cannot be extruded from prepuce.
- Paraphimosis: prepuce can be drawn behind the glans but cannot return after erection).
- Hypospadias/epispadius:failure of anatomical closure of prepuce and/or urethra.
- Posthitis:inflammation of prepuce
- Balanitis:Inflammation of glans penis
- Balanoposthitis:usual for both to be involved
Dogs:suppuration and/or ulceration due to E. coli, Proteus or Haemophilus spp.
Bulls:IBR virus causes ulceration which may become secondarily infected.
Rams and wethers:occlusion of the urethral appendage as a result of calculi causing a necrotising lesion of the glans ± urethral rupture and subcutaneous leakage of urine.
- Transmissible fibropapilloma: seen in bulls, bovine papillomavirus type 2.
Multiple luxuriant growths, painful, easily traumatised. Transmissible to females. Spontaneous regression.
- Squamous cell carcinoma:seen in geldings.
Less common in bulls and dogs, low-grade malignancy may ulcerate and haemorrhage.
- Melanoma:occurs on prepuce and scrotum of grey horses. Often benign.
- Transmissible venereal tumour:seen in dogs and bitches.
- Sarcoids:equine prepuce
|Male External Genitalia - Pathology Learning Resources|
Test your knowledge using flashcard type questions
|Small Animal Soft Tissue Surgery Q&A 05|
Information by kind permission of Professor R W Else