Radiographic differences between two subtypes of bronchioloalveolar carcinoma

Area of Science:

• Pulmonology
• Oncology
• Radiology

Background:

• Bronchioloalveolar carcinoma (BAC) presents with two main histologic subtypes: alveolar and bronchiolar.
• These subtypes differ in cell morphology, with cuboidal cells in the alveolar type and tall columnar cells in the bronchiolar type.

Purpose of the Study:

• To investigate if the two morphologic types of bronchioloalveolar carcinoma are associated with different clinical and radiologic presentations.
• To compare patient data, symptoms, radiographic findings, and survival based on BAC histologic subtype.

Main Methods:

• A retrospective review of clinical records, chest radiographs, and pathologic specimens from 30 BAC patients.
• Patients were categorized into alveolar and bronchiolar groups (including mixed patterns) and compared by blinded reviewers.

Main Results:

• Radiographic findings differed significantly between the alveolar-mixed and bronchiolar groups.
• Air bronchograms were exclusively observed in the bronchiolar subtype (p < 0.0001).
• Previous chest films showed abnormalities in 80% of the alveolar-mixed group versus none in the bronchiolar group (p = 0.02), and initial films revealed definable borders more frequently in the bronchiolar group (p = 0.02).

Conclusions:

• Radiographic manifestations of bronchioloalveolar carcinoma are dependent on its histologic subtype.
• Distinct radiologic features, such as air bronchograms and lesion border definition, can help differentiate between alveolar and bronchiolar BAC subtypes.