Empty sella syndrome is a rare disorder characterized by enlargement or malformation of a structure in the head known as the sella turcica. The sella turcica is a saddle-shaped depression located in the bone at the base of skull (sphenoid bone), in which resides the pituitary gland. In empty sella syndrome, the malformed sella turcica is often either partially or completely filled with cerebrospinal fluid. As a result, the pituitary gland is often compressed and flattened so that the sella turcica appears empty. Most individuals with empty sella syndrome do not have any associated symptoms. Occasionally, headaches or pituitary dysfunction may occur. Empty sella syndrome may occur as a primary disorder, for which the cause is unknown (idiopathic), or as a secondary disorder, in which it occurs due to an underlying condition or disorder such as a pituitary tumor or trauma in the pituitary region.
The symptoms of empty sella syndrome may vary from one person to another. In most cases, especially in individuals with primary empty sella syndrome, there are no associated symptoms (asymptomatic). Often, empty sella syndrome is discovered incidentally on x-ray examination when individuals are being evaluated for other reasons.
The most common symptom potentially associated with empty sella syndrome is chronic headaches. However, it is unknown whether headaches develop because of empty sella syndrome or are a coincidental finding. Many individuals with empty sella syndrome have high blood pressure (hypertension).
In rare cases, individuals with empty sella syndrome have developed increased pressure within the skull (benign intracranial pressure), leakage of cerebrospinal fluid from the nose (cerebrospinal rhinnorhea), swelling of the optic disc due to increased cranial pressure (papilledema), and abnormalities affecting vision such as loss of clarity of vision (visual acuity).
The pituitary gland is usually not affected. The pituitary gland is a small gland located near the base of the skull that stores several hormones and releases them into the bloodstream as needed by the body. These hormones regulate many different bodily functions. Although a rare occurrence, some abnormal or decreased pituitary function can occur (hypopituitarism). A specific finding in some affected individuals, including children, has been isolated growth hormone deficiency.
Individuals with secondary empty sella syndrome are more likely to develop abnormalities affecting vision and decreased function of the pituitary.
The exact, underlying cause of primary empty sella syndrome is unknown (idiopathic).
Researchers believe that a defect in the diaphragma sellae that is present at birth (congenital defect) plays a role in the development of primary empty sella syndrome. The diaphragma sellae is a fold of dura mater (the outermost layer of the membranes that line the brain and spinal cord). The diaphragma sellae covers the sphenoid bone where the sella turcica and the pituitary are located. In some affected individuals a tear in the diaphragma sellae allows the underlying membranes to push through (herniate), which allows cerebrospinal fluid to leak out and accumulate in the sella turcica. The pressure exerted by the fluid can flatten or enlarge the sella turcica. Consequently, the pituitary becomes compressed and flattened as well. In some individuals with primary empty sella syndrome the diaphragma sellae is absent at birth. The exact role that defects in the diaphragma sella play is the development of primary empty sella syndrome is unknown. Whether it causes primary empty sella syndrome directly, occurs as part of a larger disease process or is only a predisposing factor to the development of the disorder is unresolved.
Secondary empty sella syndrome is caused by a variety of different conditions including injury or trauma to the head, pituitary tumors, infection, radiation therapy, surgery on the pituitary region, or rare disorders such as Sheehan syndrome.
Primary empty sella syndrome affects women more often than men. Most cases occur in middle-aged women who are obese and have high blood pressure (hypertension). Because most people with empty sella syndrome do not have symptoms and may go undiagnosed, determining the disorder’s true frequency in the general population is difficult. Some researchers have estimated that less than 1 percent of individuals with empty sella syndrome ultimately develop symptoms associated with the disorder.
A diagnosis of empty sella syndrome is made based upon identification of characteristic symptoms, a detailed patient history, a thorough clinical evaluation and specialized tests such as x-ray imaging techniques. Such imaging techniques may include computerized tomography (CT) scanning and magnetic resonance imaging (MRI). During CT scanning, a computer and x-rays are used to create a film showing cross-sectional images of certain tissue structures. An MRI uses a magnetic field and radio waves to produce cross-sectional images of particular organs, tissues and structures such as the sella turcica.
Many individuals with empty sella syndrome do not have any symptoms and do not require treatment. When symptoms do occur, treatment is directed toward the specific symptoms that are apparent in each individual. If the pituitary is affected, then replacement therapy for specific hormones should be administered as needed. Surgery may be necessary when cerebrospinal fluid leaks from the nose (CSF rhinnorhea).
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