PMC7827589_01
T1 MRI axial images show the stability of the colloid cyst within the third ventricle, followed by regression images were acquired in July 2015 (a), August 2017 (b), and August 2019 (c). The cyst measured 5 mm initially and at follow-up scans 2 years later, and 2.5-3 mm at his follow-up scan in 2019. The 2019 scan also shows hyperintense signal in the cyst, suggesting colloid cyst involution.
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F1
The patient was seen in the clinic for follow-up at 3 months at which point repeat imaging revealed the same cystic lesion unchanged in size, appearance, and location [Figure 1a]. One and 2 years later, he was seen in follow-up again with similar results [Figure 1b]. His surveillance was extended to 2 years at which point his imaging revealed a lesion 2.5-3 mm in size, with a hyperintense appearance consistent with involution of the colloid cyst [Figure 1c].