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The value of magnetic resonance relaxation time in staging ovarian endometrial cysts

Kazuro Sugimura, MD Masayuki Takemori, MD ^* Makiko Sugiura, PhD Hiromi Okizuka, MD Michio Kono, MD and Tetsuya Ishida, MD

Department of Radiology, Shimane Medical University, Japan ^* Department of Gynecology, Kobe Kawasaki Hospital, Japan Kobe Women's College of Pharmacy, Japan Department of Radiology, Kobe University, Japan

We evaluated the use of magnetic resonance imaging (MRI) in the pre-operative staging of 15 endometrial cysts. The effect of the iron content on the T₁ and T₂ relaxation times was assessed in confirmed endometrial cysts employing a 0.15 T MR system and a 200 MHz spectrometer. There was a positive linear correlation (r = 0.93) between the T₁ values of the lesions obtained using the MR system (T₁) and those of the resected cyst contents obtained using the spectrometer (sp-T₁). A similar relationship was found between T₂ and sp-T₂(r = 0.87). There was a negative linear relationship between the T₁, value and the cyst iron content (r = –0.81), but there was no relationship between the T₂ value and the iron content. T₁ was 412±91 ms for Stage II cysts (n = 3), 356±126 ms for Stage III cysts (n = 3) and 208±30 ms for Stage IV cysts (n = 9). The T₁ value for Stage IV cysts was significantly shorter than that for Stages II and III cysts (p<0.05). Thus, the T₁ value was useful in distinguishing fresh from old endometrial cysts, suggesting that the MRI T₁, relaxation time might be useful for staging ovarian endometrial cysts before surgery.

Key Words: MRI • ovarian endometrial cyst • relaxation time • staging

Received for publication August 28, 1991. Revision received January 2, 1992. Accepted for publication January 13, 1992.

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