Data Last Updated: Dec. 17, 2025

Adenoid Cystic Basaloid Pattern

Description

Adenoid Cystic Basaloid Pattern, the presence of a basaloid pattern on pathological examination, is a prognostic factor for adenoid cystic carcinoma of the lacrimal gland. Adenoid cystic carcinoma (ICD-O-3 morphology code 8200/3) is the most common malignant epithelial tumor of the lacrimal gland. Adenoid cystic carcinoma is a tumor composed of modified myoepithelial and ductal differentiated cells. A genetic alteration (i.e., fusion oncogene MYB-NFIB) is found in the majority of adenoid cystic carcinomas There are three histologic patterns within the adenoid cystic carcinoma group: cribriform, solid, and tubular.

Rationale

Adenoid Cystic Basaloid Pattern is a Registry Data Collection Variable in AJCC 8. This data item was previously collected as Lacrimal Gland, CS SSF #6.

Additional Info

**Source documents:** pathology report **Other names include** ACC, basaloid type adenoid cystic carcinoma

Notes

**Note 1:** **Physician Statement** * Physician statement of basaloid pattern can be used to code this data item when no other information is available. **Note 2:** **Applicable histologies** * This is most commonly found in Adenoid Cystic Carcinoma (8200/3) but can be present in other histologies.

Coding Guidelines

**1)** **Code 0.0** when the pathology report states that basaloid or solid pattern is not present **2)** **Code 0.1-100.0** when the pathology report states the percent of basaloid or solid pattern that is present **3)** **Code XXX.5** when basaloid or solid pattern present but percentage not known **4)** **Code XXX.9** when * Histopathologic pattern not documented in the medical record * Histopathologic pattern not evaluated (assessed) * Unknown if histopathologic pattern evaluated (assessed) * When histologic type other than 8200 and there is no mention of basaloid pattern
Code Description
0.0-100.0 0.0 to 100.0 percent basaloid pattern
XXX.5 Basaloid pattern present, percentage not stated
XXX.8 Not applicable: Information not collected for this case
(If this item is required by your standard setter, use of code XXX.8 will result in an edit error.)
XXX.9 Not documented in medical record
Adenoid Cystic Basaloid Pattern not assessed or unknown if assessed