A proboscis in obstetric imaging usually refers to a rare anomaly where an anterior appendage like structure is seen projecting from about the midline fetal face / forehead. Depending on the exact location, this has further been classified into various sub types (e.g. inter-orbital proboscis).
The presence of a proboscis can be associated with several anomalies which include
- trisomy 13
- ethmocephaly 3
- cyclopia : often below the level of the proboscis
A proboscis is best seen on a longitudinal facial profile view as a snout like protrusion from the face / forehead.
The word proboscis is derived from the Greek word proboskis which in turn derives from the combination of the words πρό (pro) meaning : "forth / forward / before" and βόσκω (bosko) meaning : "to feed / nourish"
- proboscis lateralis : considered a different entity
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