The neurofibroma is a benign nerve-sheath tumor in the peripheral nervous system. Ovarian fibroma
It appears in the sex cord-stromal tumour group of ovarian neoplasms. Ovary fibromas are most frequent during middle age, and rare in children. Upon gross pathological inspection, ovary fibromas are firm and white or tan. Variants with edema are especially likely to be associated with Meigs syndrome. On microscopic examination, there are intersecting bundles of spindle cells producing collagen. There may be thecomatous areas (fibrothecoma). The presence of an ovarian fibroma can cause ovarian torsion in some cases. Treatment
Benign fibromas may, but need not, be removed. Removal is usually a brief outpatient procedure or using cryotherapy in which the lesion is deep frozen (-196 degrees Celsius using liquid nitrogen) and thawed for two or more cycles, with full recovery within 3 to 4 weeks. The cryotherapy treatment needs no anesthetics and is painless. Another simple treatment is snip removal after injecting local anesthetic. See also
Acrochordon (skin tags)
Fibrous lesions

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Between 7 and 9 weeks, the placenta begins to produce progesterone in place of the corpus luteum in a process called the luteal-placental shift.After the luteal-placental shift, progesterone levels start to rise further and may reach 100 to 200 ng/mL at term. Whether a decrease in progesterone levels is critical for the initiation of labor has been argued and may be species-specific. After delivery of the placenta and during lactation, progesterone levels are very low. Progesterone levels are low in children and postmenopausal women. Adult males have levels similar to those in women during the follicular phase of the menstrual cycle. Ranges
Blood test results should always be interpreted using the reference ranges provided by the laboratory that performed the results. Example reference ranges are listed below. Sources
Animal
Progesterone is produced in high amounts in the ovaries (by the corpus luteum) from the onset of puberty to menopause, and is also produced in smaller amounts by the adrenal glands after the onset of adrenarche in both males and females. To a lesser extent, progesterone is produced in nervous tissue, especially in the brain, and in adipose (fat) tissue, as well. During human pregnancy, progesterone is produced in increasingly high amounts by the ovaries and placenta. At first, the source is the corpus luteum that has been "rescued" by the presence of human chorionic gonadotropin (hCG) from the conceptus. However, after the 8th week, production of progesterone shifts to the placenta.