case_images: PMC11809433_01
case_images: Sagittal images of the head on A, magnetic resonance imaging and B, computed tomography at the initial presentation, showing an enlarged pituitary gland with the absence of the posterior pituitary bright spot and no calcification (arrows).
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case_images: Initial noncontrast MRI revealed an enlarged pituitary gland with an isointense signal and the absence of the posterior pituitary bright spot on T1-weighted imaging (Fig. 1A). No pituitary stalk enlargement was observed, and computed tomography showed no calcification in the sellar region (Fig. 1B).
case_images: Chronological changes in Rathke cleft cyst (RCC) on T1-weighted magnetic resonance imaging with and without gadolinium enhancement. One week after the initial presentation, spontaneous shrinkage of the RCC was observed along with resolution of headaches (A: noncontrast; E: contrast-enhanced). Three months after the initial presentation, the RCC reenlarged with a recurrence of episodic headaches (B: noncontrast; F: contrast-enhanced). By 6 months, the RCC had reduced in size once again (C: noncontrast; G: contrast-enhanced), and at 9 months, the RCC had further decreased, with a faint reappearance of the posterior bright spot indicated by arrowheads (D: noncontrast; H: contrast-enhanced); however, arginine vasopressin deficiency persisted.
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case_images: One week later, a follow-up MRI demonstrated a reduction in pituitary size without gadolinium enhancement, suggesting a cystic lesion (Fig. 2A and 2E).
case_images: PMC11809433_02