Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 7 Sept 2026Clinical review pending
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Sepsis, obstruction or major bleeding during anal-cancer care
Fever with systemic illness during chemoradiotherapy, a fluctuant spreading perianal infection, obstructive vomiting or uncontrolled haemorrhage requires acute care rather than routine cancer-clinic review.
Action: Begin ABCDE assessment, obtain intravenous access, blood count, cultures, renal tests, lactate and blood-bank samples as indicated and call acute oncology, colorectal surgery and anaesthesia. Start protocol empirical IV antibiotics immediately for suspected neutropenic sepsis and obtain urgent pelvic imaging and drainage or diversion when source control is required.
Synopsis
Recognise anal squamous carcinoma despite benign mimics, examine the anal canal and inguinal nodes, obtain tissue without compromising treatment, and plan definitive chemoradiotherapy through a specialist multidisciplinary team.
Persistent anal pain, bleeding, mass, ulceration, discharge or change in continence warrants examination rather than repeated empirical haemorrhoid treatment.
Human papillomavirus is the major causal association; HIV, immunosuppression, smoking and prior HPV-related disease increase risk.
Assessment includes inspection, digital examination when tolerable, proctoscopy or examination under anaesthesia and bilateral inguinal-node palpation.
Key red flags
Fever with systemic illness during chemoradiotherapy, a fluctuant spreading perianal infection, obstructive vomiting or uncontrolled haemorrhage requires acute care rather than routine cancer-clinic review.
Investigation priorities
01
Specialist examination with biopsyFirst step
Define the primary site, size and relationship to sphincters and establish histological type.
Management branches
Worked case: ulcer with an inguinal nodeConfirm both the primary and regional spread before chemoradiotherapy
A 57-year-old has six months of worsening anal pain and bleeding despite fissure treatment. Examination shows a 3.5 cm indurated canal ulcer and a firm 2 cm left inguinal node.
Take an HPV, smoking, HIV, immune-suppression and continence history, then inspect the perineum and palpate both groins with consent; provide analgesia and avoid forcing an intolerable office examination.
At examination under anaesthesia, biopsy the ulcer without performing wide excision. Histology confirms p16-positive squamous-cell carcinoma.
National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 7 Sept 2026; clinical approval remains outstanding.