Abstract
The present study aimed to determine prevalence of non-hydrocephalic pineal cysts of different size and morphology in healthy individuals. In a cohort of healthy individuals who as part of research volunteered to undergo magnetic resonance imaging (MRI) of the brain, we performed a systematic search for occurrence of pineal cysts of different sizes, morphology and evidence of crowding of the pineal recess. Degree of crowding in the pineal recess was estimated by the imaging biomarkers anterior-posterior diameter and cyst-tectum-splenium (CTS) ratio at midsagittal MRI. The study included a cohort of 994 healthy individuals, aged 47.0 ± 21.1 years in whom a pineal cyst was demonstrated in 337/994 (37.5%) individuals. A small cyst within a mainly solid gland was observed in 252/994 (25.4%) subjects and a mainly cystic gland in121/994 (12.2%). The pineal cysts were more frequent in women than men, and were associated with age, though not with reduced prevalence in aged individuals, as previously reported. Cysts with maximum anterior-posterior diameter ≥ 10 mm were seen in 51/994 (5.1%) individuals, and with CTS ratio ≥ 0.9 in 16/994 (1.6%) individuals. The occurrence of pineal cysts is frequent and is seen more frequently in women. It usually presents as a small cyst in a predominantly solid gland; however, pineal cysts causing crowding of the pineal recess with a CTS ratio ≥ 0.9 was seen in merely 1.6% of participants.
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