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AJR 2004; 183:1799-1804
© American Roentgen Ray Society

Differentiation of Cavernous Hemangioma from Schwannoma of the Orbit: A Dynamic MRI Study

Atsuo Tanaka1, Futoshi Mihara1, Takashi Yoshiura1, Osamu Togao1, Yasuo Kuwabara1, Yoshihiro Natori2, Tomio Sasaki2 and Hiroshi Honda1

1 Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan.
2 Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka 812-8582, Japan.

OBJECTIVE. The purpose of this study was to determine the capability of dynamic contrast MRI to differentiate hemangioma from schwannoma of the orbit.

MATERIALS AND METHODS. Sixteen patients (three males and 13 females; mean age, 39 ± 17.3 [SD] years; age range, 10–71 years) with unilateral orbital tumors, including eight cavernous hemangiomas and eight schwannomas, were examined. In addition to conventional MRI, we performed a dynamic contrast study (fast spin-echo sequence, 20-sec interval) after bolus administration of the contrast material (gadopentetate dimeglumine, 0.1 mmol/kg). We evaluated the features of the contrast enhancement spread pattern and the tumors' time–intensity curves.

RESULTS. In the early phase, all the hemangiomas started the enhancement from one point or portion, although all the schwannomas started the enhancement from a wide area. The difference in the contrast-enhancement spread pattern features between the two types of tumors was statistically significant (p < 0.0001). The gradient of the time–intensity curve did not show a significant difference.

CONCLUSION. Hemangioma and schwannoma of the orbit can be differentiated by the contrast-enhancement spread pattern on dynamic MRI.


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