Chapter 23 — Anorectal Trauma from Sexual Assault

This chapter covers anorectal injury resulting from sexual assault. It is different in character from every other chapter in this manual, since the physical injury is only one part of the patient's need. Sensitivity, consent, careful documentation, and coordination with other services matter as much as the surgical assessment itself. This chapter covers presentation, examination, documentation, and management, with particular attention to the medico-legal responsibilities involved.

23.1 What Is Anorectal Trauma from Sexual Assault

Anorectal trauma from sexual assault is injury to the anal canal, perianal region, or rectum, resulting from non-consensual sexual contact. The severity ranges widely, from minor mucosal abrasion to severe laceration, sphincter disruption, or full-thickness perforation.

This condition can affect a patient of any age or sex. A child presenting with suspected sexual assault needs a specialised paediatric and forensic pathway. This is beyond the scope of this chapter, which focuses on the adult patient. Male victims are equally valid patients, and their experience is often underreported and under-recognised.

23.2 Mechanism and Spectrum of Injury

Injury typically results from forced penetration, often without adequate preparation, and sometimes involving a foreign object. The resulting injury depends on the degree of force involved, and ranges across a genuine spectrum.

Minor injury — superficial mucosal or skin abrasion, or a small fissure.

Moderate injury — a deeper laceration, or a partial sphincter injury.

Severe injury — full-thickness perforation, complete sphincter disruption, or an associated pelvic or intra-abdominal injury. This may need urgent surgical intervention, beyond the anorectal region itself.

23.3 Presentation

A patient may present immediately after the assault. Some patients delay presentation, sometimes by days or longer, out of fear, shame, or threat from the assailant. This delay does not diminish the validity or seriousness of the disclosure.

Presenting symptoms include anal or rectal pain, bleeding, and difficulty sitting or walking. Some patients disclose the assault directly. Others present with vague or unrelated symptoms, without disclosing the cause. A clinician should maintain a high index of suspicion, whenever the history and examination findings do not fit together naturally.

Significant psychological distress is expected, and should be recognised and responded to with the same seriousness as the physical injury itself.

Every step of assessment and care in this chapter should be conducted with a trauma-informed approach. This means calm, unhurried, and non-judgemental care. It should be led by what the patient is able to tolerate at each stage.

23.4 Examination

Explicit, informed consent is required before any examination, and before any forensic evidence collection. The patient should understand clearly what is being proposed, and why, at every step.

A chaperone, described in Chapter 3 as standard practice for every anorectal examination, is essential here without exception.

Wherever available, examination should be conducted by, or performed jointly with, a clinician specifically trained in forensic examination. This is not a routine anorectal examination, and the standard of documentation and evidence handling required exceeds what a general anorectal assessment alone provides.

The number of separate examinations should be kept to the minimum genuinely necessary, since each additional examination risks further distressing the patient.

Findings should be documented in precise, objective, anatomical language, avoiding any presumptive or judgemental wording. Photographic documentation, where undertaken, requires specific consent and a properly maintained chain of custody, following local forensic protocols.

23.5 Differential Diagnosis and Interpretation of Findings

Some anorectal findings, once considered specific to assault, are now recognised to also occur from other, entirely unrelated causes. These include some of the benign conditions described elsewhere in this manual, such as fissure-in-ano, described in Chapter 11. A single physical finding, taken alone, should not be presented as definitive proof of assault.

Definitive forensic interpretation belongs to a suitably trained forensic examiner. A general surgeon's role is to document findings accurately and objectively. The surgeon should treat the injury appropriately. A forensic conclusion outside their own expertise should not be reached or stated.

23.6 Investigations

Screening for sexually transmitted infections is initiated, with full detail of this screening described in Chapter 24.

HIV post-exposure prophylaxis should be considered and offered, in line with local guidelines, ideally started as soon as possible after the assault.

Hepatitis B vaccination or prophylaxis should be considered, depending on the patient's existing immunisation status.

In a female patient, pregnancy risk should be assessed, and emergency contraception discussed and offered where relevant.

Imaging, such as a CT scan, is arranged urgently if an intra-abdominal or pelvic injury is suspected in a severe case.

23.7 Principles of Management

Any life-threatening injury takes priority, and is stabilised first, before definitive anorectal assessment and repair proceed.

A laceration is repaired according to its depth and location, using the same principles described elsewhere in this manual. A sphincter injury is repaired using the techniques described in Chapters 21 and 22. A full-thickness perforation may need formal surgical repair. In a severe case, a temporary defunctioning stoma may be needed too, to protect the repair while it heals. This is the same approach described for complex cloaca reconstruction in Chapter 22.

Infection prophylaxis, described in Section 23.6, is arranged alongside the surgical management, not as an afterthought once the physical repair is complete.

Psychological support is not optional. Every patient should be offered referral to appropriate counselling or psychological support services. This referral matters as much as any physical treatment described in this chapter.

23.8 Medico-Legal Documentation and Reporting

Accurate, objective, and contemporaneous documentation is essential. Record findings as they are observed. Use the patient's own words where relevant. Use precise anatomical terms, and avoid assumptions or conclusions beyond what was directly observed.

A standardised documentation proforma, where available locally, should be used consistently, since this supports both clinical care and any subsequent legal process.

Forensic evidence, where collected, must be handled with a properly maintained chain of custody. Follow local protocols. This keeps the evidence usable, if needed for any subsequent legal proceedings.

Mandatory reporting obligations apply in many jurisdictions, particularly, though not exclusively, when a child is involved. The treating clinician should be familiar with the specific reporting requirements in their own jurisdiction. They should coordinate promptly with police or forensic medical services, as required. The patient should be kept informed of this process wherever possible.

The clinician's primary duty remains the patient's care and wellbeing throughout this process. Coordinating with legal and forensic services supports the patient's interests; it does not replace attentive clinical care.

23.9 Special Situations

A paediatric patient needs a specialised paediatric and forensic pathway, coordinated with paediatric specialists, rather than the adult-focused approach described in this chapter.

A patient presenting with significant delay may have few or no residual physical findings. The psychological impact remains fully relevant, however. So does the need for infection screening and support. A normal examination does not mean the disclosure is untrue.

A male patient deserves the same seriousness, sensitivity, and thoroughness of care as a female patient. This presentation is underreported, and at times under-recognised by services.

23.10 Complications

Infection, at the site of any repaired laceration or perforation.

Fistula formation, or stricture and stenosis, described in Chapter 18, developing during healing.

Chronic pain, or anal incontinence, described in Chapter 20, if a sphincter injury was severe or repair was delayed.

Significant, lasting psychological consequences, including post-traumatic stress, depression, and anxiety, which require ongoing support well beyond the period of physical healing.

23.11 Common Mistakes to Avoid

Approaching the assessment without a calm, trauma-informed, non-judgemental manner.

Examining without explicit consent, or without a chaperone present.

Repeating examinations more times than are genuinely necessary, adding unnecessary distress.

Offering a definitive forensic conclusion beyond one's own training and expertise.

Overlooking infection prophylaxis, emergency contraception where relevant, or psychological support referral.

Failing to meet mandatory reporting obligations where these apply.

23.12 Recording and Follow-Up

Record findings factually and objectively. Use a standardised proforma where available. Note explicitly which prophylactic treatments were offered, and whether the patient accepted or declined each one. For example: "Anal laceration, no sphincter involvement on examination, HIV post-exposure prophylaxis and hepatitis B vaccination offered and accepted, STI screening arranged, psychological support referral made, police contact per patient's wishes and local reporting requirements." Arrange follow-up specifically to review healing. Use this visit to complete any ongoing prophylaxis. Confirm that psychological support has been engaged.

23.13 Why This Chapter Matters

A patient presenting after sexual assault needs careful physical assessment and treatment, but they need sensitivity, consent, and coordinated support in equal measure. Getting the medical care right matters greatly. So does meeting medico-legal responsibilities. So does connecting the patient with psychological support. Together, these define good practice in this chapter, more than any single surgical technique. The next chapter turns to sexually transmitted infections and related conditions with anorectal manifestations.