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Spermatoceles (Spermatic Cord Cysts) in Dogs

Occurrence: rarer
Location of illness: Abdomen/pelvis

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

Spermatoceles, also known as spermatic cordThe spermatic cord is a bundle of nerves, blood vessels, lymphatic vessels, and the vas deferens that connects the testicles to the body. It plays an important role in blood supply and sperm transport. cysts, are fluid-filled cysts that can develop in the spermatic cords of dogs. These cysts are usually benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. and can reach different sizes.

The most important facts at a glance

Spermatoceles are fluid-filled cysts that form in the spermatic cordThe spermatic cord is a bundle of nerves, blood vessels, lymphatic vessels, and the vas deferens that connects the testicles to the body. It plays an important role in blood supply and sperm transport. of dogs. They often occur in older dogs but can theoretically occur at any age. The exact causes are unclear, but blockages, injuries, hormonal changes, or genetic predispositions could play a role. Symptoms are often swelling in the scrotum, Infertility, or pain.

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made by a physical examination and ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. to assess the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. and rule out other causes. In some cases, additional tests such as biopsies are necessary. Treatment depends on the size and symptoms. Small, asymptomaticAsymptomatic means that there are no recognizable symptoms of a disease. An animal can have a disease or infection without showing visible signs, which can make diagnosis and treatment more difficult. cysts are often only monitored, while larger cysts may need to be surgically removed. Antibiotics are used for infections.

The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is usually good, especially if the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. does not cause any discomfort. However, recurrence may occur, which is why regular veterinary check-ups are important. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult because the causes are not fully understood. Regular examinations and good care contribute to general health. Research focuses on genetic and hormonal factors as well as the development of new diagnostic and treatment methods.

Causes

The spermatic cords, also called ductus deferens, are part of the reproductive system of male dogs. They transport spermA sperm is a male germ cell or sex cell that contributes to the fertilization of the female egg. Sperm contain genetic material that, when combined with the egg, leads to the development of a new organism. from the testicles to the urethra, where they are mixed with other secretions to form semen. A spermatocele occurs when fluid accumulates in a section of the spermatic cordThe spermatic cord is a bundle of nerves, blood vessels, lymphatic vessels, and the vas deferens that connects the testicles to the body. It plays an important role in blood supply and sperm transport. and forms a cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause..

A frequent occurrence of spermatoceles is observed in older dogs, although they can theoretically occur at any age. The exact causes are not always clear, but it is believed that they can be caused by blockages or injuries in the area of the spermatic cordThe spermatic cord is a bundle of nerves, blood vessels, lymphatic vessels, and the vas deferens that connects the testicles to the body. It plays an important role in blood supply and sperm transport.. Another theory suggests that they can be caused by an abnormal development of the spermatic cords, which interferes with the drainageDrainage refers to the removal of fluid from body cavities, Wounds, or inflamed areas, often using a tube or other device. It is used to prevent infection and promote healing. of spermA sperm is a male germ cell or sex cell that contributes to the fertilization of the female egg. Sperm contain genetic material that, when combined with the egg, leads to the development of a new organism..

Hormonal changes, infections, or Entzündungen can also increase the risk of spermatocele formation. Sometimes there may also be genetic predispositions that make certain breeds more susceptible. Dogs with a historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. of testicular tumors or other diseases of the reproductive system may also be at increased risk.

Symptoms

Very common symptoms:

Common symptoms:

Most spermatoceles are asymptomaticAsymptomatic means that there are no recognizable symptoms of a disease. An animal can have a disease or infection without showing visible signs, which can make diagnosis and treatment more difficult. and are often discovered incidentally during a veterinary examination. If symptoms occur, they can vary depending on the size and location of the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause.. In some cases, swelling in the area of the scrotum may be observed, which is not painful.

However, some dogs may show discomfort or pain when walking or urinating, especially if the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. is large enough to put pressure on surrounding structures. In rare cases, there may be an obstructionobstruction refers to the blockage or narrowing of a hollow organ or canal, which hinders the normal flow of liquids or gases. In dogs and cats, an obstruction can occur in the digestive tract, airways, or urinary tract and often requires immediate medical treatment. of spermA sperm is a male germ cell or sex cell that contributes to the fertilization of the female egg. Sperm contain genetic material that, when combined with the egg, leads to the development of a new organism. flow, which could affect Infertility.

Occasionally, an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. of the cyst can occur, which can lead to Fever, redness, or increased pain sensitivity in the affected area. In such cases, a veterinary examination is urgently required.

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of a spermatocele usually begins with a thorough physical examination by the veterinarian. By palpating the scrotum, the veterinarian can determine whether there is any swelling or abnormality.

To confirm the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., an ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. examination of the scrotum can be performed. This imaging method allows the veterinarian to assess the structure and size of the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. and to rule out other possible causes for the swelling.

In some cases, it may be necessary to perform a fine needle aspiration or a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. to analyze the type of fluid and ensure that it is not another type of massIn pathology, the term "mass" is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer)., such as a tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions..

Therapy

The treatment of spermatoceles depends on the size of the cyst and the associated symptoms. In many cases, especially if the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. is small and asymptomaticAsymptomatic means that there are no recognizable symptoms of a disease. An animal can have a disease or infection without showing visible signs, which can make diagnosis and treatment more difficult., the veterinarian may decide only to monitor it and not to undertake immediate treatment.

For larger or symptomatic cysts, surgical removal may be considered. This procedure is called spermatocelectomy and involves the removal of the cyst to relieve discomfort and avoid possible complications.

In cases where an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. is present, the veterinarian may prescribe antibiotics to combat the infection. Pain relievers or anti-inflammatory medications can also be administered to relieve discomfort.

Prognosis and follow-up care

The prognosis for dogs with spermatoceles is usually good, especially if the cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. is small and does not cause any symptoms. Even after surgical removal, most dogs recover completely and without long-term complications.

However, it is important to note that recurrence may occur after removal of a cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause.. Regular follow-up examinations by the veterinarian can help to detect and treat a recurrence early.

In dogs that have a genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. to developing spermatoceles, long-term monitoring may be necessary to keep the reproductive tract healthy.

Prevention

Since the exact causes of spermatoceles are not fully understood, there are no specific measures for preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring.. However, regular veterinary examinations can help to detect changes in the reproductive system early.

Owners are advised to watch for signs of discomfort or unusual behavior in their dogs and to consult the veterinarian if in doubt. Good general care, including a balanced diet and regular exercise, can also help to support the general health of the dog.

For breeders, it can be helpful to check the genetic historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. of their dogs to minimize possible hereditary risks. Early castration can in some cases reduce the risk of reproductive problems, including the development of spermatoceles.

Outlook on current research

Research on spermatoceles in dogs is a growing field that aims to better understand the causes, effects, and possible treatment approaches for this condition. Spermatoceles are fluid-filled cysts that can form in the spermatic cordThe spermatic cord is a bundle of nerves, blood vessels, lymphatic vessels, and the vas deferens that connects the testicles to the body. It plays an important role in blood supply and sperm transport. or epididymis of a dog. While the exact cause of spermatocele formation is not yet fully understood, scientists suspect that genetic factors, hormonal imbalances, and physical injuries may play a role.

A significant part of current research focuses on identifying the genetic predispositions that could lead to an increased risk of developing spermatoceles in certain dog breeds. Advances in genome sequencing and molecular biological analysis are helping researchers identify specific genetic markers associated with the disease. These findings could enable the development of genetic tests in the future to identify at-risk dogs early.

Another important aspect of the research deals with the hormonal aspects of the disease. Scientists are investigating how hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. imbalances, particularly in the context of testosterone and other reproductive hormones, can affect the growth of cysts. In the long term, these studies could lead to hormonal treatments that slow down or prevent the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.

In addition, intensive research is being carried out into the development of non-invasive diagnostic methods that make it possible to identify spermatoceles early and accurately. Currently, ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. examinations are the most common diagnostic tool, but researchers are working to improve this technology to increase accuracy and minimize the need for more invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedures.

Another exciting area of research is the development of new surgical techniques for the removal of spermatoceles. Researchers are investigating how minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedures can be performed to shorten recovery time and minimize risks for the dog. These studies could lead to improved surgical standards in the coming years and significantly improve the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for affected dogs.

In summary, current research on spermatoceles in dogs aims to better understand the genetic, hormonal, and physical factors of this disease in order to develop more effective diagnostic and treatment strategies. Advances in this field could not only improve the quality of life of affected dogs but also revolutionize preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. and early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. in veterinary practice.

Frequently asked questions (FAQs)

What are Spermatoceles in Dogs? Spermatoceles are fluid-filled cysts that form in the spermatic cordThe spermatic cord is a bundle of nerves, blood vessels, lymphatic vessels, and the vas deferens that connects the testicles to the body. It plays an important role in blood supply and sperm transport. or epididymis of a dog. They can lead to swelling in the scrotum and sometimes cause pain or discomfort.
How are Spermatoceles Diagnosed in Dogs? The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made through a physical examination and ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. examinations, which help to visualize the cysts. In some cases, a fine needle aspiration may be performed to analyze the cyst fluid.
Can Spermatoceles be Dangerous in Dogs? Spermatoceles are usually benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. and rarely pose a direct danger. However, if they become large or cause pain, treatment may be necessary.
What Treatment Options are Available for Spermatoceles in Dogs? Treatment depends on the severity of the symptoms. Smaller, asymptomaticAsymptomatic means that there are no recognizable symptoms of a disease. An animal can have a disease or infection without showing visible signs, which can make diagnosis and treatment more difficult. cysts often require no treatment. In more severe cases, surgical removal of the cysts may be necessary.
Can Spermatoceles Disappear on Their Own? In some cases, smaller spermatoceles may disappear or become smaller on their own. However, larger cysts may require medical intervention.
What Causes Spermatoceles in Dogs? The exact cause is still unclear, but possible factors include genetic predispositions, hormonal imbalances, and physical injuries or infections in the genital area.
Can Spermatoceles be Prevented in Dogs? Since the exact causes are not yet fully understood, there are no specific preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures. However, a regular veterinary examination can help to detect signs early.
Which Dog Breeds are More Susceptible to Spermatoceles? There is no definitive list of breeds that are more susceptible, but some studies suggest that genetic factors may play a role. Certain lines within a breed may be at higher risk.
What is the PrognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for Dogs with Spermatoceles? The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is usually good, especially if the cysts are detected and treated early. With timely treatment, most dogs can live a normal, healthy life.
Are Spermatoceles Painful in Dogs? Smaller spermatoceles are often painless. However, larger cysts can cause discomfort or pain, especially if they press against other structures in the scrotum.