Annals of Coloproctology

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Case Report

Anorectal benign disease

Chronic fistula in ano associated with adenocarcinoma: a case report with a review of the literature: Nalini Kanta Ghosh, Ashok Kumar; Ann Coloproctol. 2024;40(Suppl 1):S1-S5. Published online May 16, 2024; DOI: https://doi.org/10.3393/ac.2022.00752.0107

Abstract PDF: The malignant transformation of chronic fistula in ano is rare, accounting for 3% to 11% of all anal canal malignancies. It results from long-standing inflammation and chronic irritation. No guidelines are available for the management of these cases. We herein present a case report of a 55-year-old man who presented with a history of constipation, perianal pain, and discharging fistula in ano of 4-year duration and underwent fistula surgery with recurrence. Biopsy of the fistulous tract revealed adenocarcinoma. He received neoadjuvant chemoradiotherapy, followed by abdominoperineal excision including excision of the fistulous tract. After 18 months of follow-up, he is free of recurrence. We present this case with a review of the literature, highlighting the management strategies.

Original Article

The Clinical Features and Charateristics of anal Cancer Arising from Chronic Fistula-in-ano.: Son, Byung Ho , Han, Won Kon , Kim, Heung Dae , Kim, Kwang Yun; J Korean Soc Coloproctol. 2002;18(6):373-378.

Abstract PDF: PURPOSE
The incidence of unhealed chronic fistula is about 7% and the cancer can occur in the longstanding unhealed fistula. The most of the cancer is mucinous adenocarcinoma. The report is diverse about treatment, adjuvant chemotherapy and prognosis. The purpose of this study is review of the clinical characteristics and survival of the anal cancer arising from chronic fistula-in-ano.
METHODS
The number of patients was 10. The diagnosis is made under pathological examination at the Kanbuk Samsung Hospital from 1983 to 2000. The retrograde study was done with patients' records and telephone questionnaire. The survival rate was calculated with Kaplan-Meier method.
RESULTS
All patients were male. The patients had symptoms of anal discharge and anal swelling suggesting the anal fistula. The patients had history of anal surgery. The external openings were multiple. Seven patients had mucinous adenocarcinoma. The prognosis was poor. Among 8 patients' follow-up data, except one patient, 7 patients died within 43 months.
CONCLUSIONS
The anal cancer can occur in longstanding unhealed fistula. In our series, all patients were male, and they had multiple opening fistula. The patient who had small size tumor have only survived. Through meticulous exploring and deep biopsy of the fistula, early detection is best method to treat the anal cancer arising from chronic fistula-in-ano.

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