Tong Jiankun, Aksenov Sergei A, Chorost Mitchell I, Rodgers William H
Department of Pathology, New York Presbyterian Queens, 56-45 Main Street, Flushing, NY 11355, USA.
Department of Surgery, St. Francis Hospital, 100 Port Washington Blvd., Roslyn, NY 11576, USA.
Case Rep Pathol. 2020 Sep 8;2020:6539064. doi: 10.1155/2020/6539064. eCollection 2020.
This report documents a rare case of an extracranial meningioma on the posterior scalp without apparent dural connection. Additionally, a sebaceous steatocystoma of the anterior scalp presented alongside the meningioma. A steatocystoma localized to the scalp is also remarkably rare. To our knowledge, this is the first report documenting an extracranial meningioma and a steatocystoma presenting concurrently on the scalp. A male patient in his thirties presented with a mass lesion on the scalp. A CT scan revealed one posterior scalp mass with no intracranial abnormalities. Post excision histologic examination confirmed an extracranial meningioma (meningothelial variant, WHO Grade I). A second anterior scalp mass, not revealed by CT scan, was discovered during surgery. It was excised and diagnosed as a steatocystoma. Meningiomas predominantly occur intracranially but, in some instances, may present as a standalone extracranial tumor intracranial abnormalities. Because extracranial meningioma is uncommon, it may be overlooked during clinical diagnosis of scalp masses. We recommend that this neoplasm be routinely considered in the differential diagnosis of extracranial tumors. The discovery of another rare tumor-a steatocystoma located in immediate proximity on the scalp-is further remarkable. We briefly review relevant case reports and etiologies and consider a potential relationship between the two neoplasms. However, it remains more likely that the concurrence of these tumors in our patient was simply coincidental.
本报告记录了一例罕见的后头皮部颅外脑膜瘤病例，该脑膜瘤与硬脑膜无明显连接。此外，在该脑膜瘤旁还出现了前头皮部的皮脂腺囊肿。头皮部局限性皮脂腺囊肿也极为罕见。据我们所知，这是首例记录头皮部同时出现颅外脑膜瘤和皮脂腺囊肿的报告。一名三十多岁的男性患者头皮出现肿块病变。CT扫描显示后头皮有一个肿块，颅内无异常。切除术后的组织学检查证实为颅外脑膜瘤（脑膜内皮型，世界卫生组织I级）。手术中发现了CT扫描未显示的前头皮第二个肿块。将其切除后诊断为皮脂腺囊肿。脑膜瘤主要发生在颅内，但在某些情况下，可能表现为独立的颅外肿瘤，而无颅内异常。由于颅外脑膜瘤并不常见，在头皮肿块的临床诊断中可能会被忽视。我们建议在颅外肿瘤的鉴别诊断中常规考虑这种肿瘤。在头皮紧邻部位发现另一种罕见肿瘤——皮脂腺囊肿，更是值得注意。我们简要回顾了相关病例报告和病因，并考虑了这两种肿瘤之间的潜在关系。然而，更有可能的是，我们这位患者中这两种肿瘤的同时出现只是巧合。
