A defect is present in the medial aspect of the left middle cranial fossa leading into the left sphenoid sinus. Through the defect the anterior most part of the left inferior temporal gyrus has herniated, with resultant distortion of the temporal pole. The sinus appears partially opacified by fluid without a convincing air-fluid level. The pituitary fossa is enlarged and empty.
Features are those of an internal encephalocoele.