PMC6010958_01
Normal perianal anatomy.. [Caption] CT scan through the female ischiorectal space shows the vagina (v), rectum (arrowhead), internal obturator muscle (black arrow), external obturator muscle (large white arrow), and ischiorectal fossa (*).
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Fig. 1 shows these CT anatomical landmarks in a normal female.
Abscesses and Fistulas.. [Caption] Diagram showing the location of bilateral abscesses in the ischiorectal fossae with fistulas to the skin of the buttocks and through the levator into pararectal spaces and the vagina to the labia.
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Left neck draining lyphadenitis.
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Histopathology showed an acute suppurative lymphadenitis with abscess formation. (Fig. 3) Many granulocytes were seen as well as histiocytes with intracellular Gram negative bacilli.