Case 189. Onchocercosis (45 y-o F)

       
 
Excised subcutaneous nodule in the neck of a Mexican female
 
       

 

  Female adults of Onchocerca volvulus are clustered in the subcutaneous tissue (HE, low power). Onchocercosis is endemic in the highland of central America, Arabian peninsula and tropical Africa, causing "river blindness" due to microfilaria invasion into the eye balls.