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[Cystic space-occupying lesions in the femoral trigone].

The differential diagnosis of cystic tumours in the region of the so-called Trigonum femorale is presented and discussed. In this context the topography of this area is demonstrated. In addition to the clinical findings sonography and computed tomography are the method of choice in finding the right diagnosis. Invasive methods such as angiography and lymphography are indicated in only few cases. US-guided fine-needle-aspiration should be preferred instead, if it is of any therapeutic relevance.