The specimen is a block of skin and subcutaneous fat from the natal cleft. Just to one side of the
midline there is a slightly raised area on the surface of the skin leading down into a track surrounded
by tan-coloured tissue. On the reverse of the specimen a smaller track can be seen surrounded by
pale scar tissue.
This presented as a painless lump in the sacral area of a man aged 33. On several
occasions pus was discharged from the sinus. The lesion was excised but recurred later and further
excision was needed.