EURORAD ESR

Case 12939

Accessory split of lateral head of gastrocnemius muscle

Author(s)
Staikidou Ioanna, Mantzikopoulos Georgios, Pikoulas Konstantinos, Giannikouris Georgios, Kokkinis Konstantinos.

KAT Hospital, CT and MRI Department; alfeiou 4 15235 Vrilissia, Greece; Email:k_pikoulas@yahoo.gr
 
Patient
female, 20 year(s)
 
 
  • Figure 1
    PDW-TSE-FS-TRA
     

    Sequential axial slices. Note the split (arrowheads) located between the lateral head of gastrocnemius muscle (LG) and the vessels of the popliteal fossa. It is fused caudally with the lateral gastrocnemius.

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Congenital;

    Sequential axial slices. Note the split (arrowheads) located between the lateral head of gastrocnemius muscle (LG) and the vessels of the popliteal fossa. It is fused caudally with the lateral gastrocnemius.

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Congenital;

    Sequential axial slices. Note the split (arrowheads) located between the lateral head of gastrocnemius muscle (LG) and the vessels of the popliteal fossa. It is fused caudally with the lateral gastrocnemius.

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Congenital;
     
     
  • Figure 2
    T1W-TSE-COR

    Coronal image at the level of popliteal fossa. Note the fusiform shape of the accessory split (arrowhead) of the lateral gastrocnemius (LG).

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Congenital;
     
     
  • Figure 3
    T2W-TSE-SAG

    Midsagittal level. Note the small attachment of the split (arrowhead) to the posterior femoral cortex. LG=lateral head of gastrocnemius.

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Congenital;
     
     
  • Figure 4
    Variations of gastrocnemius muscles
     

    normal situation. Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.

     
    Area of Interest: Extremities; Imaging Technique: Image manipulation / Reconstruction; Procedure: Normal variants; Special Focus: Congenital;

    Type I (5.6%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.

     
    Area of Interest: Extremities; Imaging Technique: Image manipulation / Reconstruction; Procedure: Normal variants; Special Focus: Congenital;

    Type II (13.6%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.

     
    Area of Interest: Extremities; Imaging Technique: Image manipulation / Reconstruction; Procedure: Normal variants; Special Focus: Congenital;

    Type III (37,5%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.

     
    Area of Interest: Extremities; Imaging Technique: Image manipulation / Reconstruction; Procedure: Normal variants; Special Focus: Congenital;

    Type IV (9%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle, grey area=popliteus muscle, small grey area=fibrous band.

     
    Area of Interest: Extremities; Imaging Technique: Image manipulation / Reconstruction; Procedure: Normal variants; Special Focus: Congenital;

    lateral accessory gastrocnemius split (9%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle, grey area=popliteus muscle, small grey area=fibrous band.

     
    Area of Interest: Extremities; Imaging Technique: Image manipulation / Reconstruction; Procedure: Normal variants; Special Focus: Congenital;
     
     
Sequential axial slices. Note the split (arrowheads) located between the lateral head of gastrocnemius muscle (LG) and the vessels of the popliteal fossa. It is fused caudally with the lateral gastrocnemius.
 
Sequential axial slices. Note the split (arrowheads) located between the lateral head of gastrocnemius muscle (LG) and the vessels of the popliteal fossa. It is fused caudally with the lateral gastrocnemius.
 
Sequential axial slices. Note the split (arrowheads) located between the lateral head of gastrocnemius muscle (LG) and the vessels of the popliteal fossa. It is fused caudally with the lateral gastrocnemius.
 
Coronal image at the level of popliteal fossa. Note the fusiform shape of the accessory split (arrowhead) of the lateral gastrocnemius (LG).
 
Midsagittal level. Note the small attachment of the split (arrowhead) to the posterior femoral cortex. LG=lateral head of gastrocnemius.
 
normal situation. Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.
 
Type I (5.6%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.
 
Type II (13.6%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.
 
Type III (37,5%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle.
 
Type IV (9%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle, grey area=popliteus muscle, small grey area=fibrous band.
 
lateral accessory gastrocnemius split (9%). Red area=popliteal artery, blue area=popliteal vein, brown area=gastrocnemius muscle, grey area=popliteus muscle, small grey area=fibrous band.
 
 
 
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