Kiyoshi Akira

Yasunori

MD #{149} Masashi Takahashi, MD #{149} Masayuki MD #{149} Yasuo Ohnaka, MD #{149} Ryuta Itoh, Monioka, MT #{149} Rikushi Monita, MD

Murata, Furukawa,

Pulmonary CT-Pathologic

located

between

the

central

bronchovascular bundle and the penlobular structure (n = 127 [66.8%]), or attached to perilobular structures (n = 30 [15.8%]). On HRCT scans, 21 small nodules (11.1%) were located on the central bronchovascular bundie; 130 small nodules (68.4%), between the central bronchovascular bundle and the penlobular structure; and 39 small nodules (20.5%), on the perilobular

structure.

On

radiographs

and

stereomicroscopic images, 43 of 74 large nodules ( > 3 mm in diameter) (58%) compressed both bronchovascular bundles and perilobular structures. The central bronchovascular bundle was invaded in only 13 large nodules (18%).

I

‘r is well

known

computed and

I

1992; 182:331-335

From the Department

University

of Radiology,

Shiga

of Medical Science, Seta-TsukinowaShiga, 520-21 Japan. From the 1989 RSNA scientific assembly. Received October 18, 1990; revision requested December 13; revision received August 9, 1991; accepted September 17. Address reprint requests to KM. © RSNA, 1992

Cho, Otsu,

Kawaguchi, MD

Nobuyuki



Kawakami,

ever, times

radiographs

because difficult

lan lesions

pulmonary

generally show varying size on

tomographic

chest

(CT) (1-3).

scans How-

these criteria are someto apply to small nodu-

seen

on

CT scans

and

other pulmonary lesions such as granulomatous infections can show a similar CT appearance (4,5), it is sometimes difficult to differentiate metastatic nodules from those with causes other than metastasis. This differentiation is of great importance for treatment of patients with malignant tumors, who are generally susceptible

to pulmonary infections. Although a new CT sign showing the connection of the nodule to the pulmonary antenial branch has recently been described

in hematogenous

metastasis

and pulmonary study is necessary sign. To elucidate

emboli (6), further to validate this the characteristics of metastatic nodules at CT examination, we performed a correlative CT-

pathologic

study of human

lungs af-

ter autopsy, focusing on the relationship between metastatic nodules and pulmonary vessels shown on high-resolution CT (HRCT) scans.

MATERIALS

AND

We studied Index terms: Computed tomography (CT), high-resolution #{149} Lung neoplasms, CT, 60.1211 #{149} Lung neoplasms, diagnosis, 60.333 Lung neoplasms, secondary, 60.333 #{149}Lung, nodule, 60.333

that

metastatic nodules smooth margins and

topsy

Radiology

MD

#{149} Kouichi

MD

Metastatic Nodules: Correlation’

To elucidate the characteristics of pulmonary metastatic nodules on high-resolution computed tomographic (HRCT) scans, a correlative computed tomographic (CT)-pathologic study was performed with five human lungs after autopsy. The relationship of metastatic nodules to pulmonary vessels was studied with HRCT scans, radiographs of the specimen, and stereomicroscopic study in 264 nodules 0.6-9.0 mm in diameter. On radiographs and stereomicroscopic images, 190 small nodules (

Pulmonary metastatic nodules: CT-pathologic correlation.

To elucidate the characteristics of pulmonary metastatic nodules on high-resolution computed tomographic (HRCT) scans, a correlative computed tomograp...
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