Today's case is a mass at the cerebellopontine angle (CPA) with classic features of an extra-axial tumor: CSF cleft (yellow arrow), displacement of subarachnoid vessels (blue arrow), and displacement of gray matter (red arrow). In addition, there is expansion of the subarachnoid space along the skull base anterior/lateral to the mass.
Differential diagnosis of a CPA mass in an adult is schwannoma, meningioma, ependymoma, and metastasis (note that ependymoma is intra-axial). Of these, schwannoma is by far the most common at this location (90%), and this was indeed a schwannoma.
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Today's case is a 70-year-old woman with bilateral thigh pain. Radiograph of the femurs reveals cortical irregularities of the lateral femurs, the classic location and appearance of bisphosphonate-related stress fracture. This is an atypical location for stress fractures in a patient who is not taking bisphosphonates.
Case courtesy of Matt Skalski, Radiopaedia.org, rID: 46147
This week we will be showing a case series of chest radiographs. Take a minute to look at the image before you read on. Can you spot the problem?
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This case demonstrates a mass at the left hilum. In addition, the left hemidiaphragm is elevated, indicating volume loss, and there is air outlining the aortic arch and proximal descending aorta (the so-called "Luftsichel sign," or "air sickle" due to its shape). Findings are classic for left upper lobe collapse (in this case post-obstructive due to the mass). The hyperinflated superior segment of the left lower lobe is what creates the air sickle, as it is situated betwixt the collapsed lung and the aorta.
Case courtesy of Dr Charlie Chia-Tsong Hsu, Radiopaedia.org, rID: 35263
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