perianal

(¦per·ē′ān·əl)

(anatomy) Situated or occurring around the anus.

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IN BRIEF: adj. - Around the posterior opening of the alimentary canal

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Around the anus.

• p. abscess — under the skin outside the anal canal. Causes sufficient pain to inhibit defecation.
• p. fistula — a syndrome of inflammation, ulceration, and draining sinuses and fistulae in the perianal region of dogs, particularly German shepherd dogs. The specific lesions include fistulae of the anal sinuses, anal sac rupture and fistulae, submucous fistulae and sinuses and fistulae of the rectum. Clinical signs include painful defecation and unpleasant odor. A variety of surgical techniques have been developed, but the condition is very resistant to treatment. Called also anal furunculosis.
• p. gland — modified sebaceous glands found in skin around the anus of dogs. Other regions also contain modified glands, e.g. the perineum, prepuce, thigh, dorsal lumbosacral area and tail base. Called also circumanal glands, hepatoid glands.
• p. gland hyperplasia — most perianal gland enlargements in male dogs are hormone-dependent hyperplasia and regress when the patient is castrated.
• p. gland tumors — nodular hyperplasia, adenomas and carcinomas are common in older male dogs, occurring occasionally in females.
• p. pyoderma — see perianal fistula (above).
• p. sinus — see perianal fistula (above).
• p. warts — papilloma around anus, virus possibly transmitted by veterinarian performing rectal examination.