Ocular Cytopathology

An atlas that features the cytologic findings of the normal features and diseases of the eye.

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Saturday, October 01, 2005

HELMINTHIC DISEASES- Cysticercus Cellulosae

CYSTICERCUS CELLULOSAE (TAENIA SOLIUM)

Cysticercosis is the most common ocular tapeworm infection. Cysticercus cellulosae is the larval stage and Taenium solium is the adult worm. T. solium is endemic in Eastern Europe, Africa, Asia, and Central and South America. Infection occurs in man when raw pork is ingested and the larvae grow into an adult worm. Ocular cysticercosis occurs if eggs are regurgitated or ingested and develop into larvae that penetrate the small intestine. The larvae may lodge in the many ocular structures including the anterior chamber, vitreous cavity, subretinal space, and subconjunctival space. [41][42][43][44][45][46][47] Pars plana vitrectomy is the currently recommended procedure for removing the cysts from the vitreous cavity. [48][49][50][51]

The intact worm is easily recognized with scolex, rostellum, suckers, and hooklets. [52]However, because of sampling bias, specimens removed with fine needle aspiration or vitrectomy may include only fragments of the cyst wall or body of the worm and the diagnosis is thereby much more difficult (Figures 8-14 and 8-15). [53]

References:
41. Kapoor S, Sood GC, Aurora AL, Sood M. Acta Ophthalmol 1977;55:927-930.
42. Mathur RN, Abraham L. Arch Ophthalmol 1962;67:562-563.
43. Kapoor S, Kapoor MS. J Pediatr Ophthalmol Strabismus 1978;15:170-172.
44. Danis P. Intraocular cysticercus. Arch Ophthalmol 1974;91:238-239.
45. Topilow HW, Yimoyines DJ, Freeman HW, Young GAM, Addison R. Ophthalmology 1981;88:1166-1172.
46. Bartholomew RS. Subretinal Cysticercosis. Am J Ophthalmol 1975;79:670-673.
47. Gupta AK, Aman A, Malik KPS, Arora B. Subconjunctival cysticercosis. J Pediatr Ophthalmol Strabismus 1978;15:323-325.
48. Hutton WL, Vaiser A, Snyder WB. Am J Ophthalmol 1976;81:571-573.
49. Santos R, Chavarria M, Aguirre AE. Am J Ophthalmol 1984;97:249-250.
50. Wood TR, Binder PS. Intravitreal and intracameral cysticercosis. Ann Ophthalmol 1979;11:1033-1036.
51. Cano MR. Ocular cysticercosis. St Louis: C.V. Mosby 1989;2:583-587.
52. Friedman AH, Pokorny KS, Suhan J, Ritch R, Zinn KM. Ophthalmologica 1980;180:267-273.
53. Kumar ND, Misra K. Diagn Cytopathol 1991;7:223-224.

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