​Differential Diagnosis of Perirectal Abscess

​Differential Diagnosis of Perirectal Abscess 
• Tuberculosis or actinomycosis; Chagas’ disease
• Rectovaginal fistula
• Proctitis—often STD associated—including syphilis, gonococcal, chlamydial, chancroid, condylomata acuminata
• Pilonidal disease
• Neutropenic enterocolitis
• Hidradenitis suppurativa
• Crohn’s disease (inflammatory bowel disease [IBD])
• Chronic anal fistula
• Cancerous lesions
• AIDS associated: Kaposi’s sarcoma, lymphoma, cytomegalovirus (CMV)