Synopsis
Recognise optic chiasm and hormonal consequences of a sellar mass, prioritise cortisol and vision, and sequence MRI, formal perimetry, endocrine classification and specialist treatment safely.
- A sellar mass may present through visual loss, headache, cranial nerve palsy, hormone excess, pituitary deficiency or incidental imaging; size alone does not establish clinical significance.
- Upward expansion compresses the optic chiasm classically causing bitemporal field loss, but junctional, asymmetric or central defects occur and patients may not notice gradual peripheral change.
- New or progressive visual acuity loss, field deterioration, diplopia or reduced consciousness requires urgent pituitary, ophthalmology and neurosurgical assessment rather than routine clinic surveillance.
- Obtain dedicated contrast pituitary MRI and formal visual acuity, colour and field testing when the lesion approaches the optic apparatus or symptoms suggest compression.
- Assess the full anterior pituitary, placing cortisol safety first; replace suspected ACTH deficiency before starting levothyroxine for central hypothyroidism.
- Measure prolactin early and request dilution when a very large lesion has only a modest reported value, because assay hook effect can disguise a macroprolactinoma.
- Functioning tumours need disease-specific biochemical confirmation: IGF-1 for acromegaly and validated cortisol testing for Cushing disease, not random growth hormone or cortisol alone.
- Most prolactinomas are treated medically even with a macroadenoma, whereas compressive non-functioning adenomas commonly require transsphenoidal surgery; decisions belong in a pituitary MDT.
Key red flags
Thunderclap headache with visual loss, ophthalmoplegia, meningism or altered consciousness suggests pituitary apoplexy and requires immediate emergency management.
Haemodynamic instability, vomiting, hyponatraemia or hypoglycaemia in a patient with a sellar lesion may represent secondary adrenal insufficiency; give hydrocortisone without waiting when crisis is suspected.
Rapidly worsening acuity, colour vision or formal field defect requires same-day specialist discussion because delayed decompression can leave permanent optic damage.
Polyuria with hypernatraemia, impaired thirst or reduced consciousness signals dangerous water-balance failure needing monitored endocrine management.
A sellar lesion in known cancer, pregnancy, recent immunotherapy or systemic inflammatory disease broadens the urgent differential beyond a routine benign adenoma.
Investigation priorities
Define lesion compartment, optic relationship, cavernous extension, haemorrhage and differential morphology.
Management branches
Visual field, acuity, colour or ocular-motor change suggests optic or cavernous compression.
- Document bedside acuity, pupils, fields, colour and eye movements, and ask specifically about sudden headache or altered consciousness.
- Check haemodynamics, glucose, sodium and urgent cortisol status, giving emergency hydrocortisone if apoplexy or adrenal failure is plausible.
- Arrange urgent pituitary MRI and formal neuro-ophthalmic testing while contacting the regional pituitary neurosurgical and endocrine team.
- Choose urgent decompression, dopamine agonist treatment or monitored conservative care according to apoplexy, tumour type and objective visual trajectory.