Perineum Pain Evaluation
Essential History Components
- The clinical interview must systematically characterize the pain and identify associated conditions, including pain characteristics, associated symptoms, pain intensity, and red flag symptoms, in patients with perineum pain 1
- Past medical history, including inflammatory bowel disease, immunosuppression, diabetes, prior anorectal surgery, or trauma, is crucial in evaluating perineum pain 1, 2
Physical Examination
- A complete examination of the pelvis and perineum is mandatory, including external inspection, digital rectal examination, and internal pelvic examination when appropriate, to evaluate perineum pain 1, 3
- Digital rectal examination is essential and improves detection of occult pathology, including palpating for tender indurated areas, masses, or abscesses 4
- Prostatic abnormalities should be checked in males during the digital rectal examination 1
Laboratory Testing
- Laboratory studies, such as complete blood count, inflammatory markers, and metabolic panel, are not routinely required but should be guided by clinical findings, including systemic illness, sepsis, or hemodynamic instability 1, 5
- Pregnancy testing should be considered in women of childbearing age 5
Imaging Studies
- Transvaginal and transabdominal ultrasound with Doppler is the initial imaging modality of choice for evaluating perineum pain, providing excellent visualization without radiation exposure 6, 7, 3, 9
- Point-of-care transperineal ultrasound shows high accuracy for perianal abscesses but is operator-dependent 2
- MRI pelvis with gadolinium contrast is a problem-solving examination when ultrasound is inconclusive, and is superior to CT for detecting fistulae and determining disease extent 6, 7, 3, 8
- Endoanal ultrasound is comparable to MRI for anorectal abscess detection but requires special skills and is often precluded by severe pain in emergency settings 2
Differential Diagnosis to Consider
- The workup must exclude serious conditions, including anorectal abscess, Fournier's gangrene/necrotizing fasciitis, thrombosed or prolapsed hemorrhoids, perianal/perineal cysts or masses, inflammatory bowel disease, and pelvic venous disorders 1, 2, 5, 6, 3, 9