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Two cases of rare pulmonary neoplastic lesions (primary pulmonary artery sarcoma and pulmonary carcinosarcoma) directly involving the pulmonary artery and presenting with findings mimicking acute pulmonary embolism are discussed. Although this represents an unusual presentation for these two lesions, they should be included in the differential diagnosis of acute pulmonary embolism in patients presenting with somewhat atypical clinical, isotopic, and radiological features. Serial lung scans followed by angiography will prove useful in arriving at the correct diagnosis.

The roentgen anatomy of the posterior horn of the lateral meniscus of the knee is presented with particular attention to the relationships between the popliteus tendon, joint capsule and meniscus. The popliteus tendon creates a tunnel as it passes obliquely through the posterior half of the meniscus creating two walls (medial and lateral) and a roof (superior attachment) and a floor (inferior attachment). The boundaries are readily visible on the double-contrast knee arthrogram. Familiarity with these relationships aids in the diagnosis of meniscal injuries.

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