Diphallia is a malformation in which the male member is completely or partially duplicated. Read more about it.


With Diphallia Doctors refer to an extremely rare malformation of the penis, the double penis. The male member is either completely or only partially created twice. In the past, there were only about 100 cases of a diphalia. Therefore, researchers can only guess what causes behind the disease. The double penis is usually corrected surgically. Here you can learn more about the diphallia.

ICD codes for this disease: ICD codes are internationally valid medical diagnosis codes. They are found e.g. in doctor's letters or on incapacity certificates. Q55

Product Overview


  • description

  • symptoms

  • Causes and risk factors

  • Examinations and diagnosis

  • treatment

  • Disease course and prognosis

Diphallia: description

The diphallia is a very rare, congenital penile malformation in which sufferers have a double penis. The term comes from the Greek (di- = twofold, phallos = penis). Normally, the male member consists of three cavernous bodies. Two are at the top and are called corpora cavernosa. Underneath is the erectile corpus spongiosum, in the middle of which runs the urethra. From him finally the glans (glans penis) comes out.

Scientists believe that errors in the child's embryonic development cause a diphalia. Therefore, the double penis is one of the so-called embryopathies. In the case of the diphallia, either the whole penis is doubled or only part of it (eg the glans). The division can be either mirror image (symmetric) or unequal (asymmetric). The two penises can be next to or on top of each other. In addition, both can differ significantly in shape and size from each other. The diphallia is divided into three groups according to Schneider:

  • Diphallus glandularis = only the penile quiche is double
  • Diphallus bifidus = divided penis (erectile tissue divided)
  • complete diphallia / double penis = complete doubling of the male member

Based on this classification, a classification was introduced that is still valid today. The diphallia are split into two main groups, which are each subdivided once again.

main group



true diphallia

complete diphallia

Affected persons have two penises, each with three cavernous bodies

partial diphallia

One penis is correctly shaped, the other smaller or completely stunted

Phallus bifidus

complete phallus bifidus

The penile shaft is divided until it exits, but each limb has only one corpus cavernosum

partial phallus bifidus

The splitting affects only a part of the penis, for example the penile sickle

The diphallia occurs in about one in 5.5 million births, so it is very rare. It was first described in 1609 in Bologna, Italy. Since then, doctors have recorded about 100 cases of double penis. Sufferers often also suffer from other malformations, such as a double kidney or shrinking testicles. In addition to the diphallia in men, comparable signs of disease in women were described. The duplication concerns the clitoris here. It is accompanied, for example, by doubled labia minora.

Diphallia: symptoms

The discomfort of a diphallia differs from case to case. In most cases, at least one penis works as usual. The stunted penis of a partial diphallia, however, is useless. In a true complete diphallia, both members may be excited to ejaculation. The same applies to a phallus bifidus. Therefore, in some cases a pure diphallia is more of a cosmetic rather than a functional problem. However, especially with increasing age often psychological problems are added (feeling of inferiority, shame, self-doubt, etc.).

In addition, problems with urination were frequently observed in a diphalia. Urine usually trickles uncontrollably from the underdeveloped penis (incontinence). In addition, the urine stream sometimes seems weaker than usual. Furthermore, many sufferers are infertile (or limited fertile). In addition, patients may suffer from other malformations (malformations) seen with a diphallus. Researchers have found that these malformations occur much more frequently in a true diphalia than in a phallus bifidus. These include, for example:

  • Defects in the rectum (anorectal malformations), eg. B. connecting ducts between the intestine and bladder (fistulas) or a narrowing of the anus
  • wrong position of the urethra mouth (hypo / epispadia), supernumerary urethra
  • outward open bladder (bladder ecstrophy)
  • Gap-breaking pubes
  • Defects of skeletal or cardiac muscles
  • Spinal malformations, including spina bifida, where the spinal cord may be exposed
  • Doubling of the large intestine, urinary bladder or kidneys, some of which are elsewhere (eg in the pelvis)
  • Shrunken testicles, testicular shifts

Diphallia: causes and risk factors

The causes of a diphallia are not fully understood due to the rare occurrence. Researchers believe that errors in embryonic development lead to a double penis. The embryonic phase begins in the second and ends at about the tenth week of pregnancy. During this time, the child's organs are formed. They arise from the three adjacent cotyledons: Ento and Ectoderm with the Mesoderm in between. At the ends, the entorod lies directly on the ectoderm. The lower part is called Kloakenmembran. This is where the intestinal exit and the urinary and genital organs form later. Defects in these cell accumulations lay the foundation for a diphallia.

Embryonic connective tissue cells accumulate around the cloacal membrane from the fourth week onwards. Genital bumps, creases and wrinkles are created. From the genital hump usually grows the penis (or the clitoris). The genital folds later form the erectile tissue. And the testicles arise from the genital ridges. Again, errors can lead to a dipole. The cloaca divides itself by a einwachsende fibreboard (septum urorectale) into a so-called urogenital sinus and an anorectic canal. This eventually results in further parts of the urinary and genital apparatus as well as the rectum.

Risk factors alcohol, nicotine, drugs and some medications

These developmental phases are particularly vulnerable to harmful substances such as alcohol, nicotine, other drugs and some medications. For example, they prevent the correct separation of the individual cell groups or damage the genetic material in the cells. With the adjacent location of the embryonic structures, scientists also try to explain why in a diphallia several malformations occur together.

A connection between the diphallia and genetic diseases in the affected person's family has been discussed, but has not yet been demonstrated. In addition, the diphallus has not been inherited until today.

Diphallia: diagnosis and examination

A diphalia is usually detected immediately after birth. It is a so-called eye diagnosis, because you can already recognize the Doppelpenis with the naked eye. The doctor may ask for medicines or harmful substances that may have been taken during childbirth and may have caused the dipiphallia. There are also cases in which patients did not go to the doctor until adulthood. Here, the doctor will ask the person directly for possible problems with urination or sexual intercourse.

If a diphallia is diagnosed, the doctor will search the body for further malformations. Unnatural passageways, he checks with a probe and ultrasound. With the stethoscope, he may be able to hear possible heart defects. An ultrasound device also helps with the examination of the internal organs. For example, duplicate or misplaced kidneys can be detected this way. Finally, ultrasound (sonography) also plays a crucial role when physicians plan the surgical procedure for a diphalia. For with his help, the individual cavernous bodies of Doppelpenis are represented. For larger malformations, the doctor will arrange a magnetic resonance imaging (MRI). On the basis of the images produced, especially soft tissues can be well assessed.

Diphallia: treatment

The diphallia or the phallus bifidus are treated surgically. Also other malformations are usually corrected by surgeons. It is always trying to treat as many defects at once and restore the natural normal state. After the procedure, the patient should, among other things, be able to completely control urination. In addition, the surgeons use extreme care in every operation so as not to hurt nerves. After all, the preservation of the erection is a major goal of the usually quite complex Diphallie treatment.

The doctors proceed differently depending on the type of double penis. In a phallus bifidus (swollen body divided), the surgeons try to merge the split penis. Under certain circumstances, the urinary drainage structures (especially the urethra) have to be newly created. In a true diphallia (two independent penises) the excess penis is severed. The intervention in a complete phallus bifidus or a complete diphallia (splitting or doubling up to the pelvis) is usually a bit more complicated. As a rule, the double penis is attached to the pubis in these cases, which makes amputation difficult (higher risk of complications).

In all cases, the desire of the patient or his guardian (parent) is crucial for the choice of the diphallia treatment. Although surgery is the only treatment for a double penis, it does not need to treat all associated malformations. For example, a single kidney is enough to detoxify and drain the body. Even minor heart defects are not operated on.

Diphallia: Disease course and prognosis

The disease outlook for a diphalia is usually strongly related to the success of the operation. In addition to a non-variable infertility (eg.through shrinking testicles), the penis may not become stiff (erectile dysfunction). The treatments may also result in a shorter limb, scarring and deformities of the penis. Most sufferers later suffer from severe mental stress. Especially in puberty, an emotionally difficult stage of development anyway, patients with diphallia are insecure and shy. Shame and inferiority feelings dominate the emotional state. These sensations are especially pronounced when the double penis has not been treated.

Prevent diphallia

Currently, the following recommendations can be made: Do not take any harmful substances, especially during pregnancy! Avoid alcohol, cigarettes and other drugs! If you are taking medication and planning to become pregnant, you should always consult a doctor for possible side effects. This person can adapt and change the medication accordingly. And let your child treat as early as possible! In this way they can give him the later psychological burden of one Diphallia spare!

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