Abstract
The posterior fossa area was defined as that situated below Twining's line while the one above was called the supratentorial area. A ratio has been calculated:\(\frac{{Posterior fossa area}}{{Supratentorial area}} \times 100 = posterior fossa ratio.\) Above 7 years this was (mean) 16.5%±2 and below 7 years 14.0%±4, with the ranges (13.2–20.2) and (9.0–19.4), respectively. When the ratio falls below 13% and 9% respectively, this implies therefore a malformation of the posterior fossa, i. e. too flat a space. Two formulas for calculation of the areas mentioned as well as two other ratios are also introduced.
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Krogness, K.G. Posterior fossa measurements I. The normal size of the posterior fossa. Pediatr Radiol 6, 193–197 (1978). https://doi.org/10.1007/BF00975535
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DOI: https://doi.org/10.1007/BF00975535