rudimentary horn

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The unicornuate uterus is a uterine abnormality which involves the malformation of one of the two Mullerian ducts. In this case, one Mullerian duct is formed correctly to the uterus while the other is undeveloped or developed incorrectly. This results in a single horn linked to fallopian tube facing the ovary (Heinonen, 1997).
A normally functioning uterus is approximately 5cm wide and 7.5cm long, 2.5cm deep. A unicornuate uterus is about half the size of a normal uterus with only one fallopian tube. Due to its shape, it appears as having one horn. The unicornuate uterus is formed in the early stages of the female’s life (Heinonen, 1997).

With this abnormality, the female will still have two ovaries, but only one will be connected to the uterus, which presents severe problems in the processes of reproduction and menstruation. This is the rarest of uterine abnormalities, which include the arcuate uterus, the septate uterus, and the bicornuate uterus. It is approximated that the unicornuate uterus occurs in 1 out of every 4,000 women. In many cases, every other site of the female reproductive system is typically functioning despite the abnormality. The occurence of a Mullerian duct malformation in the general population is about 4%, and the incidence of a unicornuate uterus is only about 0.4% (Heinonen, 1982). The symptoms of this type of uterus malformation include irregular or heavy menstruations, abdominal pain or aching, and possible urinary tract disorders (Heinonen, 1997).
The diagnosis of the unicornuate uterus is a significant issue because the condition is frequently asymptomatic. While many women who have this abnormality can have a normal pregnancy, the risk of childbirth is greatly increased with it. According to...

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... laparotomy was performed. The procedure was finished, and the findings of the procedure included a uterus with a largely pregnant rudimentary horn attached to the entire length of the uterus (Buntugu, 2008).

Another case study discusses the issues with menstruation that can arise from a unicornuate uterus with a non-communicating rudimentary horn. A 27-year-old woman was admitted to the hospital with severe, sudden abdominal pain, or acute abdomen. Her menstrual cycle was normal. She underwent laparoscopic surgery, and a non-communicating, distended rudimentary horn was found, about 45mm in size, attached to the uterus on the right side by a fibro-muscular band. The physician who conducted the study surmised that a possible cause of the acute abdomen was the distention of the uterus due to the accumulation of blood in the horn with no way of exit (Atmaca, 2005).

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