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Related Concept Videos

Torsion of Noncircular Members01:16

Torsion of Noncircular Members

617
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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Torsional Pendulum01:09

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A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played...
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Bending and Torsional Moments01:20

Bending and Torsional Moments

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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
The reaction developed in a structural element when subjected to an external force causes the element to bend. When a structural element bends upwards, it creates compressive normal forces on the top and tensile normal forces on the bottom, resulting in a couple that determines the bending...
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Ovarian Cycle01:27

Ovarian Cycle

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The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle...
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Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
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DNA Topoisomerases02:02

DNA Topoisomerases

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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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Related Experiment Video

Updated: Feb 14, 2026

Surgical Techniques to Optimize Ovarian Reserve during Laparoscopic Cystectomy for Ovarian Endometrioma
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Asynchronous Bilateral Ovarian Torsion: Three Cases, Three Lessons.

M C Lucchetti1, C Orazi2, A Lais1

  • 1Nephro-Urology Department, Bambino Gesù Children's Hospital, Rome, Italy.

Case Reports in Pediatrics
|February 7, 2018
PubMed
Summary
This summary is machine-generated.

Asynchronous bilateral ovarian torsion is a rare but serious condition in young girls. Prompt diagnosis and surgical intervention are crucial to preserve ovarian function and future fertility.

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Area of Science:

  • Gynecology
  • Pediatric Surgery
  • Reproductive Health

Background:

  • Ovarian torsion (OT) poses a significant risk of ovarian loss if surgical intervention is delayed.
  • Children and adolescents with OT face a risk of asynchronous torsion in the contralateral ovary.

Observation:

  • This study reports three cases of asynchronous bilateral ovarian torsion.
  • Clinical histories were analyzed, and current literature was reviewed.

Findings:

  • Preserving ovarian tissue during surgery is vital for future fertility in prepubertal girls with ovarian torsion.
  • The contralateral ovary's status must be carefully considered.

Implications:

  • Pelvic pain in young girls warrants suspicion of ovarian torsion.
  • Asynchronous bilateral ovarian torsion, though rare, has severe consequences and requires specialized management.
  • Pediatric surgeons and gynecologists must be aware of this condition to optimize fertility outcomes in young patients.