Spermatocele and Sperm Granuloma in Dogs
A spermatocele is a cyst in the ducts or epididymis that conduct sperm, and is usually associated with a blockage. Meanwhile, sperm granuloma (or cyst epididymis) is a chronic inflammatory condition in which a cyst has grown in the epididymis, part of the spermatic duct system, resulting in swelling of the duct or ducts. When sperm escape from these ducts into the surrounding tissue, chronic inflammation occurs. This becomes clinically important when bilateral (both sides) obstruction of the duct system leads to no live sperm in the seminal fluid.
Symptoms and Types
It is suspected in dogs that have no live sperm yet have normal-sized testes. In addition, it is rarely associated with pain or visible or palpable lesions.
- Trauma causing a break in the epididymal duct, where sperm are transported, stored, and matured, which releases sperm antigens into the surrounding tissue
- Adenomyosis - invasion of the epithelial lining cells of the epididymis into the muscular layers may be a factor; it is associated with excess estrogen production
- Overproliferation of cells of the epididymis may be a precursor of adenomyosis; not often seen in dogs younger than 2.5 years old, but is noted to some degree in 75 percent of dogs older than 7.75 years; risk increases with age.
- Complication of vasectomy or partial neuter, especially when surgical technique was not meticulous
- Congenital occlusion (blockage) of the epididymal duct (i.e., the dog was born with this disorder)
In making a determination about why your dog’s sperm is deficient, your veterinarian will look at several possibilities, such a testicular degeneration, underdevelopment of the organs, insufficient ejaculation, and incomplete ejaculation. A physical examination will be conducted to look for pain or lesions in the reproductive organs. A urinalysis and possibly a blood test will also be standard for laboratory analysis. It may also be necessary to conduct a surgical testicular biopsy and a biopsy of affected the epididymal tissue to differentiate a benign from a malignant mass.
Dogs with insufficient sperm counts rarely spontaneously recover. A bilateral blockage of the epididymis is generally not treatable except by surgical intervention.
The type of contact that occurs between the teeth where chewing is concerned
The sex cell of male animals; created in the testicles
A surgical procedure in which the tube used to carry sperm into the pelvis is removed; in most cases the sexual urges are still there although the live sperm is not.
Something that becomes worse or life threatening as it spreads
An in-depth examination of the properties of urine; used to determine the presence or absence of illness
The type of female hormone produced in the ovaries that contributes to sex drive and female characteristics
Having two sides
The process of removing tissue to examine it, usually for medical reasons.
A passage in the body with walls
Not being able to cause harm; the opposite of malignant.