Sella turcica

What it means

This is a tiny saddle-shaped dip carved into the bone at the very centre of the skull base, just behind the eyes and above the back of the nose. Its job is to hold and protect the pituitary gland, the small hormone-control gland that sits snugly inside it. The Latin name translates as 'Turkish saddle' because the bony pocket, viewed from the side, looks like a saddle with a raised front and back. It is a normal, permanent part of everyone's skull.

Why it appears on a CT, MRI or X-ray report

Because this little pocket houses the pituitary gland, radiologists comment on it whenever they look at the gland or the skull base. On a dedicated pituitary MRI it is the central landmark. Reports may note that the pocket is normal in size and shape, that it is enlarged or eroded, or that the gland inside partly fills it. The phrase 'empty sella' is common and usually harmless: it means the pocket looks mostly filled with fluid because the gland is thin and flattened.

What it usually means

On its own, a mention of this bony pocket is purely a location marker — it tells you the radiologist is describing the region around the pituitary gland. A pocket described as normal in size and shape is reassuring. The most common notable finding is a 'partially empty' or 'empty sella', where the gland sits flattened and the space looks filled with spinal fluid. This is very common, often found by chance, and in most people causes no symptoms and needs no treatment. Less commonly, the pocket may be enlarged or its walls thinned by a slow-growing pituitary lump pressing outward over time. In that case the report focuses on the gland itself, not the bone. The shape of the pocket can also hint at long-standing pressure changes inside the skull. As always, the location word matters less than the specific finding attached to it.

When to follow up

The name alone needs no action. An 'empty sella' noted by chance, with no symptoms, generally needs nothing more than a mention. Follow up with your doctor if the report describes the pocket as enlarged or eroded, if a pituitary lump is named, or if you have symptoms such as persistent headaches, vision changes (especially loss of side vision), or signs of a hormone imbalance like unusual tiredness, weight change, or menstrual changes. These point to the gland, not the bony saddle itself.

A plain-language way to picture it

Picture an egg cup holding a small egg. The cup is this bony hollow; the egg is the pituitary gland it cradles. The cup itself is just a holder — what people usually care about is the egg sitting in it. A radiologist naming the cup is simply telling you which shelf of the skull they are looking at, right at the centre, deep behind the eyes.