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What is Empty sella syndrome and explain in detail?
Empty sella syndrome is the condition when the pituitary gland shrinks or becomes flattened, filling the sella turcica  with cerebrospinal fluid instead of the normal pituitary. It can be discovered as part of the diagnostic workup of pituitary disorders, or as an incidental finding when imaging the brain.

Signs and symptoms
If there are symptoms, people with empty sella syndrome can have headaches and vision loss. Additional symptoms would be associated with hypopituitarism.
Additional symptoms are as follows:
Abnormality of the middle ear ossicles
Cryptorchidism
Dolichocephaly
Arnold-Chiari type I malformation
Meningocele
Patent ductus arteriosus
Muscular hypotonia
Platybasia

Cause
The cause of this condition is divided into primary and secondary, as follows:

The cause of this condition in terms of secondary empty sella syndrome happens when a tumor or surgery damages the gland, this is an acquired manner of the condition.
~70% of patients with idiopathic intracranial hypertension will have empty sella on MRI
The cause of primary empty sella syndrome is a congenital defect (diaphragma sellae)

Mechanism
The normal mechanism of the pituitary gland sees that it controls the hormonal system, which therefore has an effect on growth, sexual development, and adrenocortical function. The gland is divided into anterior and posterior.Its pathophysiology is such that individuals affected with the condition can have cerebrospinal fluid build-up, which in turn causes intracranial pressure leading to headaches for the individual.

Diagnosis
The diagnosis of empty sella syndrome, done via examination (and test), may be linked to early onset of puberty, growth hormone deficiency, or pituitary gland dysfunction (at an early age). Additionally there is:

CT scan 
MRI scans

Classification
There are two types of empty sella syndrome: primary and secondary.

Primary empty sella syndrome occurs when a small anatomical defect above the pituitary gland increases pressure in the sella turcica and causes the gland to flatten out along the interior walls of the sella turcica cavity. Primary empty sella syndrome is associated with obesity and increase in intracranial pressure in women. In most cases, especially in people with primary empty sella syndrome, there are no symptoms and it does not affect life expectancy or health