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Pinworms in Appendix (Oxyuriasis)

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Pinworms (Enterobius vermicularis) were an incidental finding in this middle-aged patient who underwent hysterectomy and staging procedure for adenocarcinoma of the endometrium. The lateral "spines" (actually longitudinal blade-like ridges running the length of the worm) are identifying features of the pinworm. Courtesy of: Ed Uthman, Houston, Texas.

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