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The femoral triangle is an anatomical space in the anterior upper thigh that contains several palpable structures.
The major boundaries can be recalled with the mnemonic SAIL 1,2:
lateral border: medial border of sartorius
medial border: medial border of adductor longus
superior border: inguinal ligament
From lateral to medial 1:
femoral sheath (thickening of the deep fascia of the thigh) which has three compartments (from lateral to medial):
femoral vein (within the intermediate compartment of the femoral sheath) and deep lymph nodes
femoral canal (the medial compartment of the femoral sheath) which contains fat and lymph nodes (of Cloquet)
The basic order can be recalled with the mnemonics seen here.
The femoral triangle is best seen on coronal reformats but because of its curved nature around the anterior thigh it cannot always be fully seen. Cherian and Parnell 2 have proposed a radiologic femoral triangle (as opposed to the above described anatomic femoral triangle) with the following boundaries:
laterally: femoral vein
medially: pectineus muscle
superiorly: inguinal ligament