Bone pate is collected in a basin during mastoidectomy from the healthy, disease-free mastoid cortex
and is set aside.
Periosteum of size 10 mm X 20 mm was harvested from mastoid cortex
below linea temporalis to tip of mastoid and kept dry.
7% cases showed subperiosteal abscess which were associated with erosion of the outer wall of mastoid cortex
We describe the case of a 22-year-old woman who presented with a slowly growing osseous lesion of the mastoid cortex
The abscess occurs over the mastoid cortex
when the infectious process within the mastoid air cells extends into the subperiosteal space.
Axial (Image A and B) and Coronal (Image C) showed left middle ear cholesteatoma causing erosion of left sigmoid sinus plate (Arrow Image C), larger left mastoid abscess formation with irregular destruction of lateral bony mastoid cortex
and overlying postauricular abscess.
On removal of the mastoid cortex
, the extradural abscess drained spontaneously through a tegmen defect.
The periosteum over the mastoid bone was removed, and the mastoid cortex
It was sessile, covered by a layer of periosteum, and firmly attached to the mastoid cortex
Biopsy of the left mastoid cortex
showed fibrous dysplasia.
Drilling was performed between the border of the mass and mastoid cortex
to further delineate its boundaries.
Periosteum was harvested from the mastoid cortex
and prepared to approximate 125% of the area of tympanic perforation.