BRAF and mucinous adenocarcinoma: Despite apparent source control, the patient re-presented two months later with a larger collection, now extending into the right thigh. Repeat debridement and biopsy of the flank and right thigh abscess tissue confirmed a diagnosis of mucinous adenocarcinoma of appendiceal origin. Immunohistochemistry demonstrated intact mismatch repair protein expression, and molecular testing detected a BRAF mutation.