We herein report a case of Creutzfeldt-Jakob disease (CJD) with a V210I mutation and discuss the pathological findings. The patient's clinical course was quite similar to that of patients with sporadic CJD. Diffusion-weighted magnetic resonance imaging (MRI) disclosed a high signal intensity in the basal ganglia and cerebral cortices. Pathologically, spongiform degeneration of neurons and their processes with reactive astrocytosis was observed. Prion protein immunostaining revealed diffuse positive and plaque-type patterns. Only one Japanese case of CJD with this type of mutation has been reported to date, but without any pathological examination results. Therefore, this report is considered to be highly significant for understanding CJD.

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Genetic counselors routinely assess and understand clients’ needs at the beginning of a session. Attending a genetic counseling session with or without companions is an objective sign that genetic counselors can easily notice. This study focused on clients’ reasons for their accompaniment status for genetic counseling, which we categorize into attending with or without a companion(s). A questionnaire survey and interviews were conducted using snowball sampling, starting with the chief executive officer (CEO) of the Japanese hereditary breast and ovarian cancer (HBOC) support group. Of 32 participants, 19 continued with an in‐depth interview after answering the questionnaire. Five themes were identified from the interview: (1) personal confidence, (2) decision‐making style, (3) family members’ habits and time availability, (4) considerations and conflicts with family members, and (5) healthcare provider's suggestion. Our data suggested that the clients expected their companion(s) to play certain roles. This indicates that the reasons of accompaniment status will be helpful for genetic counselors to understand both clients’ and their families’ motivations, personalities, habits, and psychosocial backgrounds. In a high‐context culture such as that of Japan, accompaniment status may be a helpful sign to understand clients’ true worries. In addition, some companions may be future clients in genetic counseling, due to the genetic nature of the disease. In conclusion, our study indicated that it is important for genetic counselors to record accompaniment status before the initial genetic counseling and to pay attention to its reasons at the beginning of the session, which may lead them to understand the client's psychosocial background to facilitate better client‐centered genetic counseling.

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