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We report a case of a chondral delamination lesion due to medial parapatellar plica friction syndrome involving the medial femoral condyle. This mimicked a torn medial meniscus in clinical and radiological presentation. Arthroscopy revealed a chondral delamination flap, which was debrided. Diagnosis of chondral lesions in the knee can be challenging. Clinical examination and MRI have good accuracy for diagnosis and should be used in tandem. Early diagnosis and treatment of chondral lesions are important to prevent progression to early osteoarthritis.

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Pneumomediastinum is sometimes observed in adult patients but its occurrence in pediatric patients (especially infants) is very rare. We here report a 14-month-old male infant who had subcutaneous emphysema, pneumomediastinum, and importantly, pneumopericardium. He had no particular past histories. He abruptly had cough, fever, and eruption on the abdomen. Computed tomography and echocardiography revealed pneumomediastinum and pneumopericardium. Antibiotics, rest, and supportive therapy ameliorated the condition. We must be aware that pneumomediastinum, and importantly pneumopericardium, can be present in a pediatric patient with subcutaneous emphysema. The infant's symptoms disappeared under strict monitoring of respiratory status, nasal oxygen therapy and antibiotic therapy.