Brain Anatomy HE BRAIN consists of the cerebrum, the diencephalon (which contains the thalamus, hypothalamus, tuber cinereum, and infundibulum), the brainstem (which includes the midbrain, pons and medulla oblongata), and the cerebellum. The cerebrum and the cerebellum form the bulk of the brain (Figure 1). Cerebellar tonsils are two pegs of tissue that project from the inferior surface of the cerebellum at the base of the brain. The inferior vermis is a bundle of tissues connecting the two halves of the cerebellum. 1 These two structures can also protrude downward into the

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TRAUMATIC PNEUMOTHORAx is a rare athletic injury, and the condition can be missed after a rib injury if subtle signs and symptoms are not recognized. Although most pneumothorax injuries can be managed conservatively, an undiagnosed pneumothorax can be life threatening. Returning to play too early can lead to progression of the pneumothorax; therefore, the medical staff needs to be aware of this condition to properly treat it. Because of its rarity, there are only limited, mostly anecdotal, guidelines dealing with return to play. This column presents two cases suggesting possible return-to-play criteria.