PMC3196200_01
Purulent umbilical discharge with erythema and umbilical mass.
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fig1
Physical examination revealed an initial temperature of 38.9 C, purulent umbilical discharge with erythema, and tender umbilical mass (Figure 1).
(a) and (b): heterogeneous urachal collection with calculus and gas formation communicating with the umbilicus.
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fig2
Computed tomography scan confirmed the diagnosis of infected urachal sinus showing a heterogeneous collection with calculus and gas formation communicating with the umbilicus (Figures 2(a) and 2(b)). 
Infra-umbilical midline incision was used to excise the sinus and fibrous tract.
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fig3
An infraumbilical midline incision was used to excise the sinus and fibrous tract (Figure 3).