These unusual swellings are due to Spigelian Hernias.

 

This is due to a congenital muscular weakness lateral to the rectus muscles, inferior to the transumbilical line.  This is where the posterior rectus sheath becomes absent (semicircular line of Douglas).

 

J. E. Losanoff1, B. W. Richman1 and J. W. Jones (2002): Spigelian hernia in a child: case report and review of the literature. Hernia (2002) 6: 191-193

 

    

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