Extradural vs subdural haematoma: lemon vs banana

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.

Annotated image

The shape is the key to help differentiate between extradural and subdural haematomas as the fruits illustrate.

Banana image in public domain. Original file: http://imagespng.com/Detail/2011/Banana--PNG-Transparent-image-.html

Lemon image in public domain. Original file: http://imagespng.com/Detail/501/Lemon-PNG-Transparent-image.html

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 is usually the key:

  • extra-dural haematoma is lentiform like a lemon
  • subdural haematoma 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
Published: 20th Apr 2014
Last edited: 12th Jul 2017
Inclusion in quiz mode: Excluded

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