Extraskeletal Ewing sarcoma (EES) is a rare, malignant small round-cell tumor, and involvement of the spinal epidural space is unusual. Here, we report a case of spinal epidural EES in a 46-year-old man who presented with back pain. Magnetic resonance imaging revealed a dumbbell-shaped right paravertebral mass extending through the ipsilateral neural foramen, with focal bone marrow infiltration. After surgical resection and adjuvant chemoradiotherapy, progressive bone marrow involvement and vertebral metastasis were observed on follow-up imaging. This case highlights the diagnostic challenges of epidural EES and underscores the importance of recognizing bone marrow involvement, which is rare in EES.

Objective: This study aimed to quantitatively assess abnormalities in the talar dome cartilage using MRI T2 mapping, with additional analyses based on the Lauge-Hansen (LH) classification and anatomical locations. Materials and Methods: This retrospective study analyzed 78 patients who underwent ankle MRI with T2 mapping for acute ankle trauma between January 2021 and October 2022. Patients were classified into the supination (S) and pronation (P) groups based on the LH classification, and then divided into subgroups based on posterior malleolus (PM) involvement. The T2 values for the talar cartilage were quantitatively measured in six anatomical regions defined by the combination of medial vs.lateral and anterior vs. central vs. posterior. The T2 mapping values in each region of the talus were compared between the S and P groups and between the PM and non-PM injury groups using t-tests. The T2 values were also compared between the medial and lateral sides within each group. Results: Among the 78 patients (mean age, 38.62 ± 14.82 years; 47 male), 53 and 25 were in the S and P groups, respectively, and 53 patients showed PM involvement. In comparison with the P group, the S group exhibited higher T2 values in the medial portion (61.27 ± 8.30 vs. 54.03 ± 6.96; P < 0.001) and lower T2 values in the lateral talus (54.95 ± 8.47 vs. 64.15 ± 7.31; P < 0.001). The PM injury group showed higher T2 values in the posterior region than the non-PM injury group (P ≤ 0.011). Within the PM injury group, T2 values were higher in the anteromedial and posterolateral regions than on the opposite sides (P= 0.037 and 0.011, respectively). Conclusion MRI T2 values demonstrated significant regional variations in the talar dome cartilage in acute ankle trauma, and the T2 values may reflect different ankle trauma mechanisms and PM involvement. Thus, T2 mapping can facilitate evaluation of talar cartilage alterations.

Objective: This study aimed to quantitatively assess abnormalities in the talar dome cartilage using MRI T2 mapping, with additional analyses based on the Lauge-Hansen (LH) classification and anatomical locations. Materials and Methods: This retrospective study analyzed 78 patients who underwent ankle MRI with T2 mapping for acute ankle trauma between January 2021 and October 2022. Patients were classified into the supination (S) and pronation (P) groups based on the LH classification, and then divided into subgroups based on posterior malleolus (PM) involvement. The T2 values for the talar cartilage were quantitatively measured in six anatomical regions defined by the combination of medial vs.lateral and anterior vs. central vs. posterior. The T2 mapping values in each region of the talus were compared between the S and P groups and between the PM and non-PM injury groups using t-tests. The T2 values were also compared between the medial and lateral sides within each group. Results: Among the 78 patients (mean age, 38.62 ± 14.82 years; 47 male), 53 and 25 were in the S and P groups, respectively, and 53 patients showed PM involvement. In comparison with the P group, the S group exhibited higher T2 values in the medial portion (61.27 ± 8.30 vs. 54.03 ± 6.96; P < 0.001) and lower T2 values in the lateral talus (54.95 ± 8.47 vs. 64.15 ± 7.31; P < 0.001). The PM injury group showed higher T2 values in the posterior region than the non-PM injury group (P ≤ 0.011). Within the PM injury group, T2 values were higher in the anteromedial and posterolateral regions than on the opposite sides (P= 0.037 and 0.011, respectively). Conclusion MRI T2 values demonstrated significant regional variations in the talar dome cartilage in acute ankle trauma, and the T2 values may reflect different ankle trauma mechanisms and PM involvement. Thus, T2 mapping can facilitate evaluation of talar cartilage alterations.

Objective: This study aimed to quantitatively assess abnormalities in the talar dome cartilage using MRI T2 mapping, with additional analyses based on the Lauge-Hansen (LH) classification and anatomical locations. Materials and Methods: This retrospective study analyzed 78 patients who underwent ankle MRI with T2 mapping for acute ankle trauma between January 2021 and October 2022. Patients were classified into the supination (S) and pronation (P) groups based on the LH classification, and then divided into subgroups based on posterior malleolus (PM) involvement. The T2 values for the talar cartilage were quantitatively measured in six anatomical regions defined by the combination of medial vs.lateral and anterior vs. central vs. posterior. The T2 mapping values in each region of the talus were compared between the S and P groups and between the PM and non-PM injury groups using t-tests. The T2 values were also compared between the medial and lateral sides within each group. Results: Among the 78 patients (mean age, 38.62 ± 14.82 years; 47 male), 53 and 25 were in the S and P groups, respectively, and 53 patients showed PM involvement. In comparison with the P group, the S group exhibited higher T2 values in the medial portion (61.27 ± 8.30 vs. 54.03 ± 6.96; P < 0.001) and lower T2 values in the lateral talus (54.95 ± 8.47 vs. 64.15 ± 7.31; P < 0.001). The PM injury group showed higher T2 values in the posterior region than the non-PM injury group (P ≤ 0.011). Within the PM injury group, T2 values were higher in the anteromedial and posterolateral regions than on the opposite sides (P= 0.037 and 0.011, respectively). Conclusion MRI T2 values demonstrated significant regional variations in the talar dome cartilage in acute ankle trauma, and the T2 values may reflect different ankle trauma mechanisms and PM involvement. Thus, T2 mapping can facilitate evaluation of talar cartilage alterations.

Objective: This study aimed to quantitatively assess abnormalities in the talar dome cartilage using MRI T2 mapping, with additional analyses based on the Lauge-Hansen (LH) classification and anatomical locations. Materials and Methods: This retrospective study analyzed 78 patients who underwent ankle MRI with T2 mapping for acute ankle trauma between January 2021 and October 2022. Patients were classified into the supination (S) and pronation (P) groups based on the LH classification, and then divided into subgroups based on posterior malleolus (PM) involvement. The T2 values for the talar cartilage were quantitatively measured in six anatomical regions defined by the combination of medial vs.lateral and anterior vs. central vs. posterior. The T2 mapping values in each region of the talus were compared between the S and P groups and between the PM and non-PM injury groups using t-tests. The T2 values were also compared between the medial and lateral sides within each group. Results: Among the 78 patients (mean age, 38.62 ± 14.82 years; 47 male), 53 and 25 were in the S and P groups, respectively, and 53 patients showed PM involvement. In comparison with the P group, the S group exhibited higher T2 values in the medial portion (61.27 ± 8.30 vs. 54.03 ± 6.96; P < 0.001) and lower T2 values in the lateral talus (54.95 ± 8.47 vs. 64.15 ± 7.31; P < 0.001). The PM injury group showed higher T2 values in the posterior region than the non-PM injury group (P ≤ 0.011). Within the PM injury group, T2 values were higher in the anteromedial and posterolateral regions than on the opposite sides (P= 0.037 and 0.011, respectively). Conclusion MRI T2 values demonstrated significant regional variations in the talar dome cartilage in acute ankle trauma, and the T2 values may reflect different ankle trauma mechanisms and PM involvement. Thus, T2 mapping can facilitate evaluation of talar cartilage alterations.

Objective: This study aimed to quantitatively assess abnormalities in the talar dome cartilage using MRI T2 mapping, with additional analyses based on the Lauge-Hansen (LH) classification and anatomical locations. Materials and Methods: This retrospective study analyzed 78 patients who underwent ankle MRI with T2 mapping for acute ankle trauma between January 2021 and October 2022. Patients were classified into the supination (S) and pronation (P) groups based on the LH classification, and then divided into subgroups based on posterior malleolus (PM) involvement. The T2 values for the talar cartilage were quantitatively measured in six anatomical regions defined by the combination of medial vs.lateral and anterior vs. central vs. posterior. The T2 mapping values in each region of the talus were compared between the S and P groups and between the PM and non-PM injury groups using t-tests. The T2 values were also compared between the medial and lateral sides within each group. Results: Among the 78 patients (mean age, 38.62 ± 14.82 years; 47 male), 53 and 25 were in the S and P groups, respectively, and 53 patients showed PM involvement. In comparison with the P group, the S group exhibited higher T2 values in the medial portion (61.27 ± 8.30 vs. 54.03 ± 6.96; P < 0.001) and lower T2 values in the lateral talus (54.95 ± 8.47 vs. 64.15 ± 7.31; P < 0.001). The PM injury group showed higher T2 values in the posterior region than the non-PM injury group (P ≤ 0.011). Within the PM injury group, T2 values were higher in the anteromedial and posterolateral regions than on the opposite sides (P= 0.037 and 0.011, respectively). Conclusion MRI T2 values demonstrated significant regional variations in the talar dome cartilage in acute ankle trauma, and the T2 values may reflect different ankle trauma mechanisms and PM involvement. Thus, T2 mapping can facilitate evaluation of talar cartilage alterations.

Myositis ossificans (MO) is defined as a lesion where abnormal ossification forms in soft tissues, such as muscle, fascia, and ligament, usually as a result of trauma. It commonly appears in areas such as the thigh, hip, and elbow, though it can affect any part of the body. In the forensic field, MO resulting from trauma is reported to be valuable evidence of repeated physical abuse. This case report describes a deceased adult male with an intellectual disability, whose cause of death was multiple injuries from assault. Postmortem computed tomography (PMCT) and autopsy findings revealed MO of both thighs associated with repeated physical abuse. This case also showed typical findings of MO on PMCT imaging, characterized by well-defined, high-density lesions within the quadriceps. Adults with intellectual disabilities are at high risk of abuse and assault. Therefore, autopsy findings of MO can serve as important evidence in forensic practice, considering the possibility of repeated abuse.

Myositis ossificans (MO) is defined as a lesion where abnormal ossification forms in soft tissues, such as muscle, fascia, and ligament, usually as a result of trauma. It commonly appears in areas such as the thigh, hip, and elbow, though it can affect any part of the body. In the forensic field, MO resulting from trauma is reported to be valuable evidence of repeated physical abuse. This case report describes a deceased adult male with an intellectual disability, whose cause of death was multiple injuries from assault. Postmortem computed tomography (PMCT) and autopsy findings revealed MO of both thighs associated with repeated physical abuse. This case also showed typical findings of MO on PMCT imaging, characterized by well-defined, high-density lesions within the quadriceps. Adults with intellectual disabilities are at high risk of abuse and assault. Therefore, autopsy findings of MO can serve as important evidence in forensic practice, considering the possibility of repeated abuse.

Myositis ossificans (MO) is defined as a lesion where abnormal ossification forms in soft tissues, such as muscle, fascia, and ligament, usually as a result of trauma. It commonly appears in areas such as the thigh, hip, and elbow, though it can affect any part of the body. In the forensic field, MO resulting from trauma is reported to be valuable evidence of repeated physical abuse. This case report describes a deceased adult male with an intellectual disability, whose cause of death was multiple injuries from assault. Postmortem computed tomography (PMCT) and autopsy findings revealed MO of both thighs associated with repeated physical abuse. This case also showed typical findings of MO on PMCT imaging, characterized by well-defined, high-density lesions within the quadriceps. Adults with intellectual disabilities are at high risk of abuse and assault. Therefore, autopsy findings of MO can serve as important evidence in forensic practice, considering the possibility of repeated abuse.

Myositis ossificans (MO) is defined as a lesion where abnormal ossification forms in soft tissues, such as muscle, fascia, and ligament, usually as a result of trauma. It commonly appears in areas such as the thigh, hip, and elbow, though it can affect any part of the body. In the forensic field, MO resulting from trauma is reported to be valuable evidence of repeated physical abuse. This case report describes a deceased adult male with an intellectual disability, whose cause of death was multiple injuries from assault. Postmortem computed tomography (PMCT) and autopsy findings revealed MO of both thighs associated with repeated physical abuse. This case also showed typical findings of MO on PMCT imaging, characterized by well-defined, high-density lesions within the quadriceps. Adults with intellectual disabilities are at high risk of abuse and assault. Therefore, autopsy findings of MO can serve as important evidence in forensic practice, considering the possibility of repeated abuse.