Extra axial collection: banana v lemon

Case contributed by Dr Ian Bickle


Young male. Out of hours trauma. Cause unspecified.

Patient Data

Age: 25 years old
Gender: Male

Acute right extra-dural haematoma.

Acute left subdural haematoma.

The shape is the key - as the fruits explain.

Case Discussion

Following head trauma, CT is usually performed, if clinical conditions merit imaging.

The major concern is always BLOOD, in particular abnormalities amendable to outcome influencing surgical procedures.

This particularly relates to extra-axial collections - extradural and subdural haematomas.

How does one know which is which?    The answer is fruity!

The shape if usually the key:

An extra-dural is lentiform like a lemon.

A subdural is sickle shaped like a banana.

Image with thanks to Dr I Waldron, Consultant Radiologist, Doncaster Royal Infirmary, UK.

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Case information

rID: 28888
Case created: 20th Apr 2014
Last edited: 14th Mar 2016
Inclusion in quiz mode: Included

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