Main » Infectious diseases » Snail-mediated Helminthiases » Schistosoma haematobium
Photo 1. Ecology of Schistosoma haematobium infection. Increased land use through the development of irrigation projects as in Egypt and the Sudan may result in an increasing incidence of Schistosoma haematobium transmission through Bulinus snails breeding in the irrigation canalSchistosoma In this village 62% of children from two to six years were infected.
Photo 2. Haematuria. Haematuria, often at the end of urination, is a characteristic early clinical feature of infection with this parasite. Typical terminal spined eggs of Schistosoma haematobium (see 293) may be found in the centrifuge deposit.
Photo 3. Eggs in section of bladder. Schistosome ova laid by female worms in the vesical plexus are retained in the vesical tissues and later become calcified. (x 20)
Photo 4. X-ray of bladder showing filing defects due to large noduleSchistosoma Active proliferating papillomatous or granulomatous lesions are responsible for the bladder-filling defects seen radiologically in the early stages of the infection.
Photo 5. Nodules due to Schistosoma haematobium. The appearance of a nodular lesion in the vesical wall as seen at open operation is well shown here.
Photo 6. X-ray of bladder with calcification. Widespread fibrosis and eventually calcification of the bladder wall result in this 'fetal-head' appearance.
Photo 7. X-ray of dilated ureters. Gross tortuosity and dilatation of the ureters result from stenosis of the ureteric orifices due to calcification.
Photo 8. X-ray of kidney showing bilateral hydronephrosiSchistosoma Unilateral and bilateral hydronephrosis due to vesical and ureteric destructive lesions are not uncommon in haematobium infection.
Photo 9. Persistent hydronephrosis in child. Hydronephrosis due to Schistosoma haematobium infection in children is often reversible with adequate antischistosomal drug treatment. In this six-year-old the lesion persisted despite therapy.
Photo 10. Squamous cell carcinoma. In areas where Schistosoma haematobium infection is intense, the incidence of vesical cancer is high. Squamous-cell carcinoma is the type most commonly found, and ova of Schistosoma haematobium are often present in such tumours. Adenocarcinoma also occurSchistosoma (x 90)
Photo 11. Adenocarcinoma of bladder showing large numbers of eggs.
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