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Basal Cell Adenoma Versus Pleomorphic Adenoma of the Parotid Gland: CT Findings

¹ Department of Radiology, Taipei Veterans General Hospital and School of Medicine, National Yang-Ming University, 201 Shih-Pai Rd., Section 2, Taipei, Taiwan.
² Department of Pathology, Taipei Veterans General Hospital and School of Medicine, National Yang-Ming University, Taipei, Taiwan.

View larger version (104K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1A —54-year-old man with typical basal cell adenoma. CT shows round, distinct margin and homogeneous contrast enhancement on unenhanced (A) and contrast-enhanced (B) scans.

View larger version (114K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1B —54-year-old man with typical basal cell adenoma. CT shows round, distinct margin and homogeneous contrast enhancement on unenhanced (A) and contrast-enhanced (B) scans.

View larger version (94K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2A —66-year-old woman with typical basal cell adenoma. CT shows large cystic component (arrows) in tumor on unenhanced (A) and contrast-enhanced (B) scans.

View larger version (112K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2B —66-year-old woman with typical basal cell adenoma. CT shows large cystic component (arrows) in tumor on unenhanced (A) and contrast-enhanced (B) scans.

View larger version (167K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2C —66-year-old woman with typical basal cell adenoma. Photomicrographs of tumor specimen show well-defined tumor capsule (arrows, C).

View larger version (163K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2D —66-year-old woman with typical basal cell adenoma. Photomicrographs of tumor specimen show well-defined tumor capsule (arrows, C).

View larger version (114K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3A —66-year-old man with typical basal cell adenoma. CT shows small cystic components (arrows, B) in tumor on unenhanced (A) and contrast-enhanced (B) scans, which is compatible with pathologic appearance.

View larger version (106K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3B —66-year-old man with typical basal cell adenoma. CT shows small cystic components (arrows, B) in tumor on unenhanced (A) and contrast-enhanced (B) scans, which is compatible with pathologic appearance.

View larger version (162K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3C —66-year-old man with typical basal cell adenoma. Photomicrograph of tumor specimen shows microcysts (arrows).

View larger version (100K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4A —76-year-old man with typical basal cell adenoma and intratumoral hemorrhage. Unenhanced CT scan shows fluid–sediment level (arrows).

View larger version (109K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4B —76-year-old man with typical basal cell adenoma and intratumoral hemorrhage. Contrast-enhanced CT scans show lobulated contour, distinct margin, fluid–sediment level (arrows, B) and ring enhancement (arrowheads, B).

View larger version (109K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4C —76-year-old man with typical basal cell adenoma and intratumoral hemorrhage. Contrast-enhanced CT scans show lobulated contour, distinct margin, fluid–sediment level (arrows, B) and ring enhancement (arrowheads, B).

View larger version (168K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4D —76-year-old man with typical basal cell adenoma and intratumoral hemorrhage. Photomicrographs of tumor specimen show well-defined tumor capsule with fibrotic change (arrows, D) and hemosiderin-laden macrophages (arrows, E), which correspond to intratumoral hemorrhage.

View larger version (207K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4E —76-year-old man with typical basal cell adenoma and intratumoral hemorrhage. Photomicrographs of tumor specimen show well-defined tumor capsule with fibrotic change (arrows, D) and hemosiderin-laden macrophages (arrows, E), which correspond to intratumoral hemorrhage.

View larger version (98K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5A —Tumor originally diagnosed as typical basal cell adenoma in 33-year-old woman. CT shows indistinct margin (arrows, A) and prominent contrast enhancement on unenhanced (A) and contrast-enhanced (B) scans. Because of atypical image appearances and age deviation compared with other cases, pathology review was suggested. Diagnosis was verified as atypical basal cell adenoma.

View larger version (96K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5B —Tumor originally diagnosed as typical basal cell adenoma in 33-year-old woman. CT shows indistinct margin (arrows, A) and prominent contrast enhancement on unenhanced (A) and contrast-enhanced (B) scans. Because of atypical image appearances and age deviation compared with other cases, pathology review was suggested. Diagnosis was verified as atypical basal cell adenoma.

View larger version (142K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5C —Tumor originally diagnosed as typical basal cell adenoma in 33-year-old woman. Photomicrographs of tumor specimen show capsular invasion (arrows, C) and focal cribriform pattern of tumor cells (arrows, D).

View larger version (133K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5D —Tumor originally diagnosed as typical basal cell adenoma in 33-year-old woman. Photomicrographs of tumor specimen show capsular invasion (arrows, C) and focal cribriform pattern of tumor cells (arrows, D).

View larger version (131K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6A —56-year-old woman with atypical basal cell adenoma. Unenhanced (A) and contrast-enhanced (B) CT scans show round tumor with distinct margins and heterogeneous contrast enhancement with low-attenuation areas (arrows, B). Image patterns are similar to those of typical basal cell adenoma.

View larger version (126K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6B —56-year-old woman with atypical basal cell adenoma. Unenhanced (A) and contrast-enhanced (B) CT scans show round tumor with distinct margins and heterogeneous contrast enhancement with low-attenuation areas (arrows, B). Image patterns are similar to those of typical basal cell adenoma.

View larger version (180K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6C —56-year-old woman with atypical basal cell adenoma. Photomicrographs of tumor specimen show capsular extension (arrow, C) and focal cribriform pattern (arrows, D) of tumor cells.

View larger version (183K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6D —56-year-old woman with atypical basal cell adenoma. Photomicrographs of tumor specimen show capsular extension (arrow, C) and focal cribriform pattern (arrows, D) of tumor cells.

View larger version (97K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7A —54-year-old woman with basal cell adenocarcinoma. Unenhanced CT scan shows lobulated contour.

View larger version (103K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7B —54-year-old woman with basal cell adenocarcinoma. Contrast-enhanced CT scans show strong heterogeneous enhancement and lobulated contour (arrows, C).

View larger version (131K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7C —54-year-old woman with basal cell adenocarcinoma. Contrast-enhanced CT scans show strong heterogeneous enhancement and lobulated contour (arrows, C).

View larger version (164K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7D —54-year-old woman with basal cell adenocarcinoma. Photomicrographs of tumor specimen show capsular extension (arrows, D) and nuclear atypia (E) of tumor cells.

View larger version (157K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7E —54-year-old woman with basal cell adenocarcinoma. Photomicrographs of tumor specimen show capsular extension (arrows, D) and nuclear atypia (E) of tumor cells.

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