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Case Reports in Medicine
Volume 2013, Article ID 231652, 3 pages
Case Report

A Case of Pulmonary Hamartoma Showing Rapid Growth

1Department of Infection, Allergy, Clinical Immunology and Laboratory Medicine, Akita University Graduate School of Medicine, 1-1-1 Hondo, Akita 010-8543, Japan
2Department of Otolaryngology, Kansai Medical University, 2-5-1 Shin-machi, Hirakata City, Osaka 573-1010, Japan
3Japan Labour, Health and Welfare Organization, Akita Rosai Hospital, 30 Karuizawa Shimotai, Odate City, Akita 018-5604, Japan
4Noshiro Yamamoto Medical Association Hospital, 105-11 Hiyama Shin-tazawa, Noshiro City, Akita 016-0151, Japan

Received 16 May 2013; Revised 7 August 2013; Accepted 21 August 2013

Academic Editor: Gianfranco D. Alpini

Copyright © 2013 Masamichi Itoga et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A 65-year-old man was admitted for detailed examination of a growing nodular shadow in the left lung. The nodular shadow was initially detected in a routine chest X-ray check-up in March 2012 that warranted regular chest X-ray follow-up. The nodular shadow increased in size from 12 × 15 mm to 15 × 20 mm within five months. The calculated tumor doubling time (TDT) in our case was approximately 132.2 days. A malignant tumor was strongly suspected based on the rapid growth, and tumorectomy was thus performed. Cartilaginous tissue accounted for most of the pathological specimen, but a small amount of an epithelial component was observed histologically, and we diagnosed a hamartoma. Hamartoma generally shows slow annual growth, but it is important to recognize that rapid enlargement occurs in some cases.