気胸[kikyou] pneumothorax
胸囲[kyoui] chest measurement
胸奥[kyouou] one's heart of hearts
胸郭[kyoukaku] chest
胸襟[kyoukin] one's heart

胸もと[munamoto] breast
胸腔[kyoukou] thorax
胸骨[kyoukotsu] breastbone
胸三寸[munesanzun] heart

胸腔[kyoukou] thorax
口腔外科[koukuugeka] dental surgery
耳腔[jikou] inside the ear
体腔[taikou] body cavity
体腔壁[taikouheki] body wall

内腔[naikou] lumen (anatomical)
口腔[koukou] the oral cavity
鼻腔[bikou] the nasal cavity
腹腔[fukkou] abdominal cavity
口腔癌[koukougan] oral cancer