Robust classification of odontogenic cysts on panoramic radiographs using convolutional neural networks.

OBJECTIVE

To develop an artificial intelligence for detecting and classifying odontogenic cysts on panoramic radiographs (PR).

STUDY

DESIGN

A convolutional neural network (Inception-V3) was trained on 1424 PR, including 712 with histopathologically confirmed cysts (298 radicular cysts [RC], 231 dentigerous cysts [DC], 130 odontogenic keratocysts [OKC], 33 residual cysts, 20 ameloblastomas [AM], and 712 controls without cysts [NC]). Data augmentation and dropout were applied to reduce overfitting. During training, 10-fold cross-validation guided model and hyperparameter selection. Performance was assessed by accuracy, sensitivity, specificity, precision, F1 score, and confusion matrices. Gradient-weighted class activation maps were used to confirm cyst detection.

RESULTS

Binary classification (no cyst vs cyst) achieved an accuracy of 0.88 (sensitivity: 0.79, specificity: 0.97, precision: 0.97, F1-score: 0.87). Ternary classification (NC, RC, DC) reached 0.85 accuracy. Multi-class classification (NC, RC, DC, OKC/AM) yielded 0.67 accuracy, with reduced sensitivity for aggressive lesions.

CONCLUSIONS

Although using a single-center dataset with few PRs for rare pathologies, the model demonstrated strong performance in detecting and classifying odontogenic cysts, particularly for binary and benign differentiation. Furthermore, it proved robust to confound pathological findings. This high specificity within a heterogeneous control group shows promise as a supportive diagnostic tool in clinical practice.