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Related Concept Videos

Ovarian Cycle01:27

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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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Folliculogenesis is the development of ovarian follicles, the specialized structures within the ovarian cortex where oogenesis, or egg development, occurs. This process is essential for female reproductive health and begins during fetal development when primordial follicles are formed. Each primordial follicle comprises a primary oocyte in the center, surrounded by a single layer of squamous pre-granulosa cells. These follicles remain dormant in late prophase I of meiosis until triggered by...
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The ovaries are roughly the size of almonds and measure approximately 2 to 3 centimeters in length. These paired structures are situated within the pelvic region and are anchored by the mesovarium—a peritoneal extension that also connects them to the wider structure of the broad ligament. The support system extends to the suspensory ligament, housing blood and lymphatic vessels. In addition, the ovarian ligament tethers the ovaries to the uterus.
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Oogenesis01:22

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Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
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Related Experiment Video

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Case 210: Primary ovarian lymphoma.

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  • 1From the Department of Radiology, Wan Fang Hospital, Taipei Medical University, 111 Hsing-Long Road, Section 3, Taipei 116, Taiwan, Republic of China (J.C.W.C., W.P.C.); and Departments of Pathology (C.L.C.) and Radiology (W.P.C.), School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan, Republic of China.

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A 45-year-old woman presented with abdominal symptoms and a high cancer antigen (CA) 125 level. Imaging revealed an abdominopelvic mass, prompting further investigation for malignancy.

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Area of Science:

  • Oncology
  • Medical Imaging

Background:

  • A 45-year-old woman with a history of poor appetite and weight loss presented with acute abdominal discomfort, nausea, and vomiting.
  • Normal white blood cell count and no prior history of malignancy were noted.

Observation:

  • Physical examination revealed a palpable abdominopelvic mass.
  • Elevated cancer antigen (CA) 125 level of 1366 U/mL.

Findings:

  • Abdominopelvic computed tomography (CT) identified a significant mass lesion.
  • No other metastatic lesions were detected in the patient's body.

Implications:

  • The clinical presentation and elevated CA 125 suggest a potential gynecologic malignancy, likely ovarian cancer.
  • Further diagnostic workup is crucial for definitive diagnosis and treatment planning.