Department of Radiology, Gifu University, 1-1 Yanagido, Gifu, 501-1194, Japan.
Department of Pathology, Gifu University, Gifu, Japan.
Jpn J Radiol. 2022 Jun;40(6):578-585. doi: 10.1007/s11604-021-01243-0. Epub 2022 Jan 4.
This study aimed to describe the MRI findings of epithelial-myoepithelial carcinoma (EMC) of the parotid gland.
Seven patients (four males and three females) aged 40-86 years (mean age, 64 years) with histologically proven EMC of the parotid gland who underwent surgical resection after preoperative MRI were enrolled. MRI images were retrospectively reviewed and contrasted with pathological findings.
Five patients (71%) had predominantly solid lesions, and two (29%) had predominantly cystic lesions. All seven lesions had well-demarcated margins and capsules without the invasion of adjacent structures. The capsules were incomplete in five lesions (71%) and complete in two (29%). Four lesions (57%) exhibited a multinodular structure with internal septa. Cystic components were observed in three lesions (43%). On T1-weighted images, the solid components were frequently homogeneous (5/7, 71%), and demonstrated isointensity in five lesions (71%) and hypointensity in two (29%) relative to the spinal cord. On T2-weighted images, the solid components were usually heterogeneous (6/7, 86%), and demonstrated hyperintensity in five lesions (71%) and isointensity in two (29%) relative to the spinal cord. The mean apparent diffusion coefficient value of the solid components was 0.967 × 10 mm/s.
Parotid gland EMCs usually appeared as predominantly solid lesions with well-demarcated margins and capsules. A multinodular structure with internal septa was characteristics of EMCs.
本研究旨在描述腮腺上皮-肌上皮癌（EMC）的 MRI 表现。
本研究回顾性分析了 7 例经术前 MRI 检查、术后组织病理学证实为腮腺 EMC 患者的资料，患者均为男性 4 例，女性 3 例，年龄 40-86 岁（平均年龄 64 岁）。对 MRI 图像进行了回顾性分析，并与病理结果相对照。
5 例（71%）患者的肿瘤主要为实性成分，2 例（29%）患者的肿瘤主要为囊性成分。7 例病灶均边界清楚，有包膜，无周围结构侵犯。5 例（71%）包膜不完整，2 例（29%）包膜完整。4 例（57%）肿瘤呈多结节状，内部有分隔。3 例（43%）可见囊性成分。T1WI 上，实性成分多为均匀信号（5/7，71%），5 例（71%）与脊髓等信号，2 例（29%）呈低信号。T2WI 上，实性成分多不均匀（6/7，86%），5 例（71%）呈高信号，2 例（29%）与脊髓等信号。实性成分的平均表观扩散系数值为 0.967×10mm/s。
腮腺 EMC 通常表现为边界清楚、有包膜的实性为主的病灶，多呈多结节状，内部有分隔，是 EMC 的特征性表现。
