[Inca and paternal anxiety or ultrasound hair tangle]

A villous tumour on the occiput of his own unborn daughter is followed up by the author, using serial ultrasound examinations. On closer investigation, the tumour is identified as a very prominent mop of hair on the occiput of the foetus. Differential diagnosis (which also reflects paternal anxiety) includes hygroma colli, which may present a similar ultrasonographical appearance.