A case report: Anorectal melanoma and review literature

Tóm tắt

Anorectal melanoma (ARM) is an extremly rare case. It is an aggressive maglinancy. ARM is difficult to diagnose because of its non specific symptoms. The clincal sign is retal bleeding, tenesmus, an anorectal lump and change in bowel habits and it is like another diseases, for example hemorrhoid, anorectal polypoid and cancer…Diagnose this disease based on clinical, endoscopic and MRI examination and especially biopsy. We present a case of male 79 year-old in Viettiep hospital with perineal pain and rectal bleeding. He was admitted and diagnosed ARM by MRI and Endoscopy and postoperative histopathology. The patient was undergone surgery. The result of Histo-pathology is ARM. We emphasize the role of MRI in diagnosis and evaluation stage of disease that can help for treatment. The hypo or mixed intense on T2, hyperintense on T1, hyperintense in Diff and low in ADC, hyperenhencment after gadolinium injection are factors for positive and differential diagnose between other anorectal tumors.  In conclusion, ARM is a rare lesion but it can be suggested for diagnose with MRI so we suggest that MRI should be examination for diagnostic and treatment purpose.