Clinical features of medical pneumomediastinum.

Purpose: The clinical features of pneumomediastinum are clarified.

Methods: Eight patients with pneumomediastinum, caused by other than trauma or operative, diagnostic, or therapeutic trouble (medical pneumomediastinum), were studied retrospectively.

Results: There were seven men and one woman with an average age of 17.

Recurrent squamous cell carcinoma of the breast with undifferentiated features: report of a case.

Squamous cell carcinoma of the breast is a rare type of cancer, the origin of which is still uncertain. We report a case of squamous cell carcinoma of the breast with a recurrent tumor that showed undifferentiated features. The patient was a 55-year-old woman who originally presented with a left breast mass in the upper outer quadrant.