PMC9201108_01
(A) Coronal T2-weighted image shows a mature cystic teratoma in the right ovary. At the periphery of the cystic space (black asterisk), there is a crescent-shaped solid component (white arrowheads). (B) Close contact between neural tissue (black asterisk) and dense lymphoid aggregate (white asterisk) on hematoxylin & eosin stain (x20). This aspect was observed on a section of the crescent-shaped solid component presented in (A).
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F1
Given the paraneoplastic association, we performed a CT scan of the thorax, abdomen and pelvis which revealed a right ovarian mass suggestive for an ovarian teratoma; the pelvic MRI (with contrast) confirmed the aspect of a right mature cystic ovarian teratoma (shown in Figure 1A) for which she was scheduled for surgery. The histopathological exam confirmed the mature ovarian teratoma, highlighting dense lymphocyte infiltration near neural tissue shown in Figure 1B. 4 days later, she returned on the psychiatric ward displaying a substantial improvement in the mental status.