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Rathke's cleft cyst

Summary

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  • Benign, non-neoplastic sellar/suprasellar lesion
  • Derived from remnants of Rathke's pouch
  • Typically asymptomatic; may cause headaches, visual disturbances, or endocrine dysfunction

Pathophysiology

  • Originates from remnants of Rathke's cleft, an embryological structure
  • Lined by ciliated columnar or cuboidal epithelium
  • Contains proteinaceous fluid, mucoid material, or cellular debris
  • May enlarge over time due to fluid accumulation or haemorrhage

Demographics

  • Prevalence: 12-33% in autopsy studies
  • More common in females (F:M ratio 2:1)
  • Can occur at any age, but typically diagnosed in adults (30-50 years)
  • Rare in children and adolescents

Diagnosis

  • Often incidental finding on imaging studies
  • Clinical presentation (if symptomatic):
    • Headaches
    • Visual disturbances (e.g., bitemporal hemianopsia)
    • Endocrine dysfunction (e.g., hyperprolactinemia, hypopituitarism)
  • Differential diagnosis:
    • Craniopharyngioma
    • Pituitary adenoma
    • Arachnoid cyst
    • Cystic pituitary apoplexy

Imaging

  • MRI:
    • T1-weighted: Variable signal intensity (dependent on protein content)
    • T2-weighted: Typically hyperintense
    • No enhancement with gadolinium (wall may enhance if inflamed)
    • "Waxy" appearance on T2-weighted images
  • CT:
    • Hypodense cystic lesion
    • Calcifications rare (unlike craniopharyngiomas)
  • Key features:
    • Well-defined, smooth margins
    • No solid component
    • Lack of calcification

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  • 30-year-old patient had imaging after a road traffic accident.
  • An incidental sellar-suprasellar lesion that was T1 hyperintense and T2-hypointense was consistent with a Rathke's cleft cyst.
  • Other than fluctuting changes in internal signal intensity, the lesion had not changed in over a 5 year period.
  • Despite mass effect on the chiasm, there has been no visual impairment.

Treatment

  • Asymptomatic cases:
    • Observation with serial imaging
    • Endocrine function monitoring
  • Symptomatic cases:
    • Surgical intervention:
    • Transsphenoidal approach (most common)
    • Transcranial approach (for large suprasellar extension)
    • Goals: Cyst drainage, partial wall resection
  • Postoperative management:
    • Hormone replacement therapy if needed
    • Follow-up imaging to assess for recurrence
  • Recurrence rate: 5-10%
  • Radiation therapy: Generally not recommended due to benign nature

Differential diagnosis

Differential Diagnosis Differentiating Feature
Craniopharyngioma Calcifications on CT; solid or mixed solid-cystic components; suprasellar predominance
Cystic pituitary adenoma Typically off-midline; may show septations or fluid-fluid level; solid enhancement on contrast MRI
Arachnoid cyst Follows CSF signal on all sequences including FLAIR suppression; no wall enhancement
Cystic pituitary apoplexy Haemorrhagic T1 hyperintensity within the lesion; fluid-fluid level; gland enlargement
Epidermoid cyst Restricted diffusion on DWI with low ADC values; more irregular margins
Dermoid cyst Fat signal on T1 and T2 with chemical shift artefact; may show fat-fluid level
Teratoma Mixed solid and cystic components; fatty signal on T1; may calcify
Colloid cyst Located at foramen of Monro in anterior third ventricle; hyperdense on CT
Metastasis Solid or rim-enhancing sellar mass; posterior pituitary or infundibular involvement
Aneurysm Flow voids on MRI; pulsation artefacts; confirms on angiography