PMC6104629_01
Pit in the midline of the upper lip.
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An opening of 2 mm diameter was found at the midline of an otherwise normal upper lip, 10 mm inferior to collumela of nose and 4 mm superior to white roll of upper lip (Fig. 1).
Inserted probe confirms the presence of sinus tract.
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Closure of skin and subcutaneous was done (Fig. 2, Fig. 3).
Excised sinus tract.
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PMC6104629_01_gr4.jpg
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It is surrounded by dermal structures and subcutaneous tissue containing skeletal muscle (Fig. 4).