Gokaslan Cigdem Ozer, Toprak Ugur, Demirel Emin, Erdim Cagri, Yardimci Aytul Hande, Turan Ceyda Bektas
Department of Radiology, Medicine Faculty, Afyon Kocatepe University, Afyon, Turkey.
Department of Radiology, Medicine Faculty, Eskisehir Osmangazi University, Eskisehir, Turkey.
Curr Med Imaging Rev. 2019;15(6):578-584. doi: 10.2174/1573405614666181005115631.
Schwannomas are benign slow-growing tumors most often associated with the cranial nerves. Schwannomas often originate from the eighth cranial nerve. They may also originate from the peripheral nervous system of the neck and extremities. However extracranial peripheral schwannomas are considered a rare entity.
The knowledge of rare localizations and typical imaging findings will lead to a successfulradiological diagnosis. Therefore, in this study, we present the clinical findings and MRI characteristics of schwannomas with a rare localization involving the peripheral, lower and upper extremity and intramuscular regions.
The hospital database was screened for patients with an extracranial soft tissue mass. Twenty-one cases of schwannomas were found in rare localization. We analyzed the MR images of these patients retrospectively. The MR images were evaluated in terms of tumor location, signal intensity, and enhancement pattern. The histological examination of all the patients confirmed the diagnosis of schwannoma.
In 21 patients, the schwannomas were peripheral, localized to upper (n = 6) and lower extremities (n = 11). The remaining four patients had intramuscular schwannomas. The patients diagnosed with intramuscular schwannomas had schwannomas in sternocleidomastoid, gastrocnemius, triceps muscle and lateral wall of the abdomen. The average long-axis diameter of the tumor was 27.7 mm and the average short-axis diameter was 16.4 mm. The contrast pattern was diffused in eight tumors and peripheral in 13.
In this study, we present clinical findings and MRI characteristics of schwannomas with a rare localization involving the peripheral, lower and upper extremity and intramuscular regions.
神经鞘瘤是良性生长缓慢的肿瘤，最常与颅神经相关。神经鞘瘤常起源于第八颅神经。它们也可能起源于颈部和四肢的周围神经系统。然而，颅外周围神经鞘瘤被认为是一种罕见的实体。
了解罕见的定位和典型的影像学表现将有助于成功进行放射学诊断。因此，在本研究中，我们展示了神经鞘瘤累及外周、下肢、上肢和肌肉内区域的罕见定位的临床发现和MRI特征。
在医院数据库中筛选颅外软组织肿块患者。发现21例神经鞘瘤位于罕见部位。我们对这些患者的MR图像进行了回顾性分析。从肿瘤位置、信号强度和强化方式方面评估MR图像。所有患者的组织学检查均确诊为神经鞘瘤。
21例患者中，神经鞘瘤位于外周，定位于上肢（n = 6）和下肢（n = 11）。其余4例患者患有肌肉内神经鞘瘤。被诊断为肌肉内神经鞘瘤的患者，其神经鞘瘤位于胸锁乳突肌、腓肠肌、肱三头肌和腹壁外侧壁。肿瘤的平均长轴直径为27.7 mm，平均短轴直径为16.4 mm。8个肿瘤的强化方式为弥漫性，13个为周边性。
在本研究中，我们展示了神经鞘瘤累及外周、下肢、上肢和肌肉内区域的罕见定位的临床发现和MRI特征。
