First published April 6, 2021.
Triphallia means being born with three penises. Until 2020 it had never been described in a human in the medical literature. That year, surgeons in Duhok, in the Kurdistan Region of northern Iraq, published a case report in the International Journal of Surgery Case Reports about a three-month-old boy with two small extra phalluses. Both were removed in a short operation, and a year later the child was reported to be doing well.
The story went viral in April 2021, and a lot of the coverage got the details wrong. Here is what the doctors actually reported, how this rare condition fits into what is known about genital development, and which popular claims do not hold up.
What the case report described
The boy's parents brought him to doctors because of swelling on the left side of his scrotum. On examination, the team found something else as well: two small projections of skin-covered tissue, one at the root of the penis and one near the scrotum, in addition to a normally placed penis.
When the surgeons examined them closely, both extra structures contained erectile tissue (corpus cavernosum and corpus spongiosum), the spongy tissue found in a typical penis. Neither contained a urethra, the tube that carries urine. That detail mattered: because the extra phalluses were not connected to the urinary tract, they could be removed without reconstructing anything, and the main penis was left untouched.
Apart from fluid around the testicle (a hydrocele, which is common in babies and usually easy to manage), the child was otherwise healthy. The authors found no family history of genetic abnormalities and no record of the mother taking medicines or being exposed to chemicals during pregnancy. At follow-up one year after surgery, he was well.
Diphallia and triphallia: how rare is this?
Triphallia belongs to a group of conditions doctors call supernumerary penises, meaning more than the usual one. The better-known form is diphallia, or penile duplication. It is estimated to occur in roughly one in five to six million live births, and only around a hundred cases have been described in the medical literature since the first written report.
That first report dates to 1609, when the physician Johannes Jacob Wecker described a case in Bologna, Italy. For four centuries afterwards, every documented case involved two phalluses at most. The Duhok report was the first published description of three, which is why it was widely called a medical first.
"First reported" is not the same as "first ever born." Rare anatomy has almost certainly occurred before without being written up in a journal, especially in places and periods with little access to surgery. What changed in 2020 was that a team documented the case carefully and published it so other clinicians could learn from it.
Why it happens: what is and is not known
The short answer is that nobody knows for sure. The external genitals form early in pregnancy from a small swelling called the genital tubercle, and from tissue around the cloacal membrane, a temporary structure in the embryo. Researchers think duplication happens when that process is disrupted in the first weeks of development. Suggested triggers include physical or chemical stress on the embryo and faults in homeobox genes, which help lay out the body plan.
Genetic work on a different patient gives a glimpse of how complicated this may be. Anatomists at Saint Louis University studied an 84-year-old body donor who had two penises and found variants in genes linked to genital development, androgen receptors, cilia and gene regulation. As one of the researchers told Live Science, it is unclear whether those findings apply to other cases, including the boy in Iraq.
Diphallia often comes with other differences, particularly in the kidneys, spine, lower bowel and anus. Babies with complex forms can need several operations and long-term care. The Duhok case was unusually simple by comparison, because the extra structures were small and separate.
Claims that went viral and what the report really says
Several details that spread through the 2021 news coverage do not match the case report.
- Location. The boy was from Duhok, in northern Iraq's Kurdistan Region. Some stories placed him in "the south of Iraq near Mosul," which is contradictory: Mosul is in the north, and the case was reported from Duhok.
- Drugs or contamination. Some articles said doctors were investigating drug use or contamination. The report says the opposite: the team found no history of exposure to medicines or chemicals in pregnancy.
- Depleted uranium. Some commentators linked the case to munitions used in Iraq since 2003. Research into birth defects in parts of Iraq is real and debated, but the case report did not make that connection, and there is no evidence tying this particular child's anatomy to any environmental cause.
- Frequency. The figure of about one in five to six million refers to supernumerary penises in general across live births, not to triphallia, which has only one published case.
- Function. The extra phalluses had no urethra and were removed. Speculation about their function beyond that is not in the report.
An often-repeated story about a boy in India said to have two penises in 2015 also circulates alongside this case. We could not find it documented in the medical literature, so it should be treated as unconfirmed.
How doctors treat these conditions
There is no single standard operation. The authors stressed that every patient presents differently and that treatment involves medical, ethical and cosmetic questions at once. Surgeons first work out which structure has the most developed erectile tissue and a working urethra, and whether the bladder, bowel or kidneys are also affected. A team that may include paediatric surgeons, urologists, radiologists and other specialists then decides whether to remove extra tissue or reconstruct.
Long-term follow-up is important, because problems with urination, growth or appearance can show up later in childhood or at puberty. In this case the decision was straightforward, which is part of why the outcome was so good.
Parents who notice anything unusual about a baby's genitals, including swelling, should talk to a doctor. Most findings in infancy turn out to be common and treatable.
Why case reports like this matter
A case report is a single observation. It cannot tell us how often a condition occurs or prove what causes it. What it can do is give the next surgeon who meets a similar child a record of what was found and what worked, which is valuable when a condition is too rare to study in large groups.
It is also worth remembering that there is a real child behind the headline. The doctors published without identifying him, and responsible coverage should do the same: keep the focus on the medicine, not on spectacle, and on the good news that a simple operation solved the problem.
Sources: International Journal of Surgery Case Reports: "Triphallia (triple penis), the first reported case in human"; Live Science: summary of the case and expert comment; Medical Dialogues: case summary; Wikipedia: Diphallia; Daily Mail: original news report.
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