RELATION BETWEEN BRONCHOSCOPIC FINDINGS AND TUMOR SIZE OF ROENTGENOGRAPHICALLY OCCULT BRONCHOGENIC SQUAMOUS-CELL CARCINOMA

A total of 105 lesions in 98 patients with roentgenographically occult bronchogenic squamous cell carcinoma were examined. The relationship of bronchoscopic findings to the depth of invasion into the bronchial wall and the length of longitudinal extension along the bronchus was d ocumented. From viewpoints of the degree of difficulty of bronchoscopi c detection and with reference to the height of the lesions, the bronc hoscopic findings were classified into three categories: remarkable, m inute, and hidden. Of the 105 lesions, 55 (52 %) were remarkable, 27 ( 26 %) were minute, and the remaining 23 (22 %) were hidden. Of the 23 hidden lesions, 12 were within and 11 were beyond the range of endosco pic visibility. The maximal depth of bronchial invasion (mean +/- stan dard error) was 3.07 +/- 0.40 mm in the category designated remarkable and 1.62 +/- 0.47 mm in the category designated minute. The depth was 0.93 +/- 0.36 mm in the hidden lesions within the range of endoscopic visibility and 0.78 +/- 0.21 mm in the hidden lesions beyond the rang e of endoscopic visibility. The maximal length of longitudinal extensi on along the bronchus was 19.6 +/- 1.5 mm in the remarkable lesions, 9 .9 +/- 1.4 mm in the minute lesions, 5.5 +/- 1.0 mm in the hidden lesi ons within the range of endoscopic visibility, and 8.6 +/- 2.1 mm in t he hidden lesions beyond the range of endoscopic visibility. It is use ful for predicting the depth of invasion to classify bronchoscopic fin dings into these three categories for the study of roentgenographicall y occult bronchogenic squamous cell carcinomas.