Malignant tumors of the nail apparatus are rare and dominated by squamous cell carcinomas (SCC). Routinely, their pre-therapy imaging is limited to radiography. Our purpose is to determine the MRI characteristics in the locoregional assessment of SCC of the nail apparatus through a series of 6 consecutive cases explored by MRI and operated, carried out over a period of 12 years. IRB approval was obtained. Two in situ and 4 invasive squamous cell carcinomas were found, sex ratio was 0.5, and the age was 55 ± 10 years (mean ± SD). Most tumors showed specific signal behavior different from that of the epidermis and dermis with high signal on T2wi (5/6) and complete or partial enhancement (6/6). The mean thickness was 3.4 mm. The deep margin of the tumor with the dermis was always well defined for Bowen’s disease (2/2) and blurred for invasive SCC. Localization involved the nail bed epithelium in all cases. Changes of the nail plate were detectable. Extension to lateral and posterior folds, hyponychium, cul-de-sac matrix, deep dermis, and bone was determined. MRI could be proposed as preoperative imaging of squamous cell carcinoma for locoregional assessment and guide biopsy.

指甲器官的恶性肿瘤很少见，主要是鳞状细胞癌 (SCC)。通常，他们的治疗前成像仅限于放射线照相。我们的目的是通过连续 6 例 MRI 探查和手术，在 12 年的时间里进行，以确定甲器具鳞状细胞癌局部评估中的 MRI 特征。获得了 IRB 的批准。原位癌2例，浸润性鳞癌4例，性别比0.5，年龄55±10岁（平均值±标准差）。大多数肿瘤表现出不同于表皮和真皮的特定信号行为，T2wi 上具有高信号 (5/6) 和完全或部分增强 (6/6)。平均厚度为 3.4 毫米。对于 Bowen 病 (2/2)，肿瘤与真皮的深部边缘始终清晰，对于浸润性 SCC 则模糊。在所有病例中定位都涉及甲床上皮。可检测到甲板的变化。确定了向外侧和后部褶皱、甲下皮、死胡同基质、深层真皮和骨骼的延伸。MRI 可作为鳞状细胞癌的术前成像，用于局部区域评估和引导活检。