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  2. Goodsall's rule - Wikipedia

    en.wikipedia.org/wiki/Goodsall's_rule

    The posterior-opening fistulas may follow a devious, curving path with some even being horseshoe-shaped before opening in the posterior midline. [2] Fistulas can be described as anterior or posterior relating to a line drawn in the coronal plane across the anus, the so-called transverse anal line. Anterior fistulas will have a direct track into ...

  3. Anal fissure - Wikipedia

    en.wikipedia.org/wiki/Anal_fissure

    Internal anal fissures stretching from anal verge till dentate line in adults on anterior side, posterior side or within any part of the inner circumference of the anal sphincter muscle can be diagnosed with a beak proctoscope of 23 mm diameter, a Hill Ferguson retractor of 23 mm diameter, a Park anal retractor or by digital rectal examination ...

  4. Perineal tear - Wikipedia

    en.wikipedia.org/wiki/Perineal_tear

    Tears vary widely in severity. The majority are superficial and may require no treatment, but severe tears can cause significant bleeding, long-term pain or dysfunction. A perineal tear is distinct from an episiotomy, in which the perineum is intentionally incised to facilitate delivery. Episiotomy, a very rapid birth, or large fetal size can ...

  5. Zenker's diverticulum - Wikipedia

    en.wikipedia.org/wiki/Zenker's_diverticulum

    Thyropharyngeus and cricopharyngeus are the superior and inferior parts of inferior constrictor muscle of pharynx respectively). The result is an outpouching of the posterior pharyngeal wall, just above the esophagus. [3] While it may be asymptomatic, Zenker diverticulum can present with the following symptoms:

  6. Obstructed defecation - Wikipedia

    en.wikipedia.org/wiki/Obstructed_defecation

    The partial division can be done laterally (on one side) or at the posterior midline (in the middle at the back of the muscle). [34] There are some positive reports of this proceudre, which was said to be more effective compared to non surgical treatments such as biofeedback and botulinom toxin A injections. [34]

  7. Median palatal cyst - Wikipedia

    en.wikipedia.org/wiki/Median_palatal_cyst

    The cyst needs to be grossly symmetrical in the palate's midline. [7] A cyst cannot be connected to a non-vital tooth or have any communication with an incisive canal. [7] It should be ovoid or round radiographically. [7] Histologically, the cyst wall should not have hyaline cartilage, large vascular spaces, or salivary glands. [7]

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