@article{ref1,
title="Acquired coccygeal nodule due to repeated stimulation by a bicycle saddle",
journal="Journal of dermatology",
year="1995",
author="Nakamura, A. and Inoue, Y. and Ishihara, T. and Matsunaga, W. and Ono, T.",
volume="22",
number="5",
pages="365-369",
abstract="Four Japanese male students, aged 14, 16, 18 and 19, were found to have a nodule in their coccygeal regions. The typical lesion was a rugby-ball-shaped, normal-colored or slightly erythematous nodule measuring 5 to 6 cm in its long axis. Histopathologically, it showed hyperplasia of collagen fibers and slight acanthosis. All four students rode to school by bicycle over long distances and long periods; three of them developed the nodule after they started bicycle riding to school. We found that the nodule shape corresponded to the saddle of the bicycle. X-ray abnormalities included bending or anterior dislocation of the coccyx in all cases and spina bifida in two cases. These nodules may have developed as a result of irritation of this region by the saddle of the bicycle.<p /><p>Language: en</p>",
language="en",
issn="0385-2407",
doi="",
url="http://dx.doi.org/"
}