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Background Dermoid cysts are benign, congenital rare lesions, frequently occurring in or near the midline. Rare localizations and variable radiologic findings have been described but remain exceptional. Case Description The authors present a rare case of a giant temporoparietal dermoid cyst in an adult female who was paucisymptomatic. No sign of rupture was identified, with a clinical presentation suggesting a slow-growing lesion. Gross total excision was performed with a favorable clinical and radiologic outcome. Conclusions Rare localizations previously published in the literature are discussed for dermoid cysts. To our best knowledge, this is the first giant dermoid cyst presenting with this localization.

To evaluate whether left hip positioning widened the access corridor using oblique lateral interbody fusion (OLIF) approach during right lateral decubitus (RLD). Ten healthy adult volunteers underwent a T2 lumbosacral MRI (1.5 T) in the supine position, RLD position with left hip in extension and then in flexion. L2–L3 to L5–S1 disc spaces were identified. At each level, left psoas surface (in cm2), access corridor (in mm) and vessel movement were calculated in the three positions. Paired t test was used for comparison. The mean surface of the left psoas ranged from 7.83 to 17.19 cm2 in the three positions (p > 0.05). From L2–3 to L4–5, in RLD, when the left hip shifted from extension to flexion, nor the access corridor nor vessel movements were significantly different. When the volunteers shifted from supine to RLD position with hip in extension, arteries moved 3.66–5.61 mm to the right (p