Extradural vs subdural hematoma: 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 hematoma.

Acute left subdural hematoma.

Annotated image

The shape is the key to help differentiate between extradural and subdural hematomas 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 hematomas.

How does one know which is which? The answer is fruity! The shape is usually the key:

  • extra-dural hematoma is lentiform like a lemon
  • subdural hematoma 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: 9th Aug 2020
Inclusion in quiz mode: Excluded