Hymenolepis nana (dwarf tapeworm)

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Clinical manifestations


  • diagnosis is made by recovery of eggs in the feces
    • oval, thin-shelled & colorless
    • 30-47 um in diameter
    • contain a centrally located 6-hooked embryo (oncosphere) separated from the outer shell by a clear space
  • embryo displays 2 polar thickenings from which thin filaments arise & extend into the clear space between the embryo & the outer shell
  • strobila may occasionally be recovered from feces



More general terms

Additional terms


  1. Clinical Diagnosis & Management by Laboratory Methods, 19th edition, J.B. Henry (ed), W.B. Saunders Co., Philadelphia, PA. 1996, pg 1288-89
  2. Harrison's Principles of Internal Medicine, 13th ed. Isselbacher et al (eds), McGraw-Hill Inc. NY, 1994, pg 933
  3. 3.0 3.1 Wkipedii: Hymenolepis nana http://en.wikipedia.org/wiki/Hymenolepis_nana
  4. 4.0 4.1 Muehlenbachs A et al Malignant Transformation of Hymenolepis nana in a Human Host. N Engl J Med 2015; 373:1845-1852. November 5, 2015 <PubMed> PMID: https://www.ncbi.nlm.nih.gov/pubmed/26535513 <Internet> http://www.nejm.org/doi/full/10.1056/NEJMoa1505892
  5. Grimm L What's Eating You: 12 Common Intestinal Parasites. Medscape. November 25, 2019 https://reference.medscape.com/slideshow/intestinal-parasites-6010996