Invasive intestinal myiasis is a rare condition that may mimic a colorectal carcinoma.
Risk factors:
(1) eating uncovered food accessible to flies
(2) defecating in the open in the presence of flies (larvae from eggs laid at the anus can migrate into the rectum)
Clinical features:
(1) presence of intestinal myiasis
(2) fungating colorectal mass
(3) variable rectal bleeding or bloody diarrhea
(4) variable mucous discharge with or without maggots
Differential diagnosis:
(1) myiasis involving a colorectal carcinoma
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Specialty: Infectious Diseases
