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Purpose: In order to prevent magnetic materials from being brought into the magnetic resonance imaging (MRI) examination room, many facilities have metal detectors, etc., but there are various types of equipment with different performance and characteristics. The purpose of this study was to evaluate each detector in actual clinical practice., Methods: At multiple facilities, gate-type magnetic detectors, pole-type magnetic detectors, handy-type magnetic detectors, and handy-type metal detectors were used to identify 9 types of objects that may be brought into the MRI examination room. We performed evaluation of detection distance measurement assuming actual operation., Results: The gate type was only able to detect objects with strong magnetism. With the pole type, the closer the measurement distance was to the pole, the more objects could be detected, and the lower the pole, the shorter the detection distance. With the handy type, there were many objects that could be detected when the device and the object were brought into close contact., Conclusion: The detectability of the instruments varied depending on the size and type of the object. It is important to understand the characteristics of each device and use it according to the purpose in carrying-in confirmation before the examination.

The patient, a 56-year-old lady, also exhibited numerous lymphadenopathy, hepatosplenomegaly, hyperleukocytosis (167,200/µl, aberrant lymphocytes 91.5%), and fever. A lymph node biopsy revealed follicular lymphoma (FL), grade 1. Peripheral blood tumor cells did not express CD10, which was a distinctive characteristic of the lymph node specimen. To prevent tumor lysis syndrome (TLI), CHOP was delivered without an anti-CD20 antibody, but afterward, residual lymphoma cells were found in peripheral blood (>80%). As a result, obinutuzumab (Obi) was given on day 8 following the second round of CHOP, and the tumor cells in the peripheral blood vanished without any major side effects like TLI. She underwent six chemotherapy sessions before receiving maintenance therapy with Obi and achieving a full metabolic response. According to reports, leukemic FL exhibits negative CD10 expression in peripheral blood lymphoma cells, while leukemic mantle cell lymphoma also shows this trait. Therefore, it is important not to confuse the two types in diagnosis. Leukemic FL with significant leukocytosis is reportedly uncommon and has a bad prognosis. Our case indicates that CHOP with Obi would be a good alternative for cases like yours, however, there have been a few cases recorded. Further case accumulation or investigation is warranted.

Since the discovery of mirror neuron system, several neurophysiological and neuroimaging studies showed that the mirror neuron system might have a role in understanding other people's actions and intentions with automatic simulation of their actions. Moreover, some studies suggested that mirror neurons have a broader role in social cognition including understanding others' emotions and empathy. It has not been proved, however, whether the mirror neuron system is necessarily involved in empathy processes. In the domain of social cognition deficits, it is important to investigate the involvement of mirror neuron system dysfunction in psychosis such as schizophrenia. Using magnetoencephalography, we examined whether antipsychotic-free schizophrenia patients displayed mirror neuron system dysfunction during observation of biological motion (jaw movement). Compared with normal controls, the patients with schizophrenia had fewer components of both the waveform and equivalent current dipole, suggesting aberrant brain activity resulting from dysfunction of the right inferior parietal cortex. They also lacked the changes of alpha band and gamma band oscillation seen in normal controls, and had weaker phase locking factors and gamma-synchronization predominantly in right parietal cortex. This finding demonstrated that untreated patients with schizophrenia exhibited aberrant mirror neuron system function based on the right inferior parietal cortex, which is characterized by dysfunction of gamma-synchronization.