|Case 7 :|
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findings reveal an intra conal mass with peripheral haemosiderin ring (Fig
1), with T1W image showing hyperintense areas suggestive of blood products
hemangioma is one of the most common benign intra orbital lesions.
hemangioma shows a female predominance, occurs most frequently in the
third and fourth decades of life.
are characterized by a slow progressive course.
consist of proptosis and deficient extroccular motility.
It is most commonly located within the muscle cone.
haemangiomas consists of large dilated endothelium lined vascular
channels, they are encompassed by a fibrous pseudocapsule.
The arterial blood supply is not prominent and blood flow is
relatively stagnant. Thus
thrombosis is common; spontaneous haemorrhage is not a feature of this
studies demonstrate a homogenous mass within the muscle cone with smooth
margins and generally uniform contrast enhancement.
MR T1 weighted images it is isointense to muscle and hyperintense on T2
weighted images. They usually
do not deform the globe which abutting it, distinguishing hemangioma from
many retrobulbar metastases. Expansion
of adjacent orbital wall is common, but bone destruction does not occur
and if present suggests a more aggressive lesion.
These tumors show no tendency to recur or undergo malignant
transformation. It is
important to differentiate haemangioma from lymphangioma of the orbit, a
lesion that is not easily removed surgically, frequently recurs, and is
more often extraconic, ill defined and less homogenous in its enhancement.
. ER, Hesselink TR, Dallow R, Grove AS Jr CT and ultrasound in the
diagnosis of cavernous hemangioma and
lymphangioma of the orbit CT J comput assisted tomogr 4: 98 – 104
Lt, Zimmermon RA.
of the orbit: Radiol clin, North AM
25: 509 – 528; 1987.
Ashok Raghavan, Manipal Hospital, Bangalore