Table 1.
Differential diagnosis of dermoid cyst of the floor of the mouth.
| Mucus extravasation phenomena |
| Mucocele |
| Plunging (cervical) ranula |
| Embryologic anomalies |
| Thyroglossal duct cyst |
| Branchial cleft cyst |
| Dermoid cyst |
| Cystic hygroma |
| Infection |
| Acute bacterial infection/cellulitis of oral floor |
| Sialadentitis of sublingual or submandibular gland |
| Viral lymphadenitis (EBV, CMV) |
| Granulomatous disease |
| Infectious |
| Mycobacterial disease |
| Cat-scratch disease |
| Actinomycosis |
| Toxoplasmosis |
| Tularaemia |
| Histoplasmosis |
| Blastomycosis |
| Noninfectious |
| Sarcoidosis |
| Wegener's granulomatosis |
| Langerhans' cell histiocytosis |
| Crohn's disease |
| Non-granulomatous inflammatory disease |
| Kawasaki's disease |
| Tumour |
| Benign tumours of salivary glands |
| Lipoma |
| Fibroma |
| Haemangioma |
| Lymphangioma |
| Angioma |
| Neurofibroma |
| Malignant tumours of salivary glands* |
| Lymphoma |
| Rhabdomyosarcoma |
| Neuroblastoma |
| Metastatic neoplasm |
| Other |
| Normal fat in the submental or submandibular area |
| HIV-related lymphadenopathy |
| Pneumocystis lymphadenitis |
| Persistent generalized lymphadenopathy |
| Nocardiosis |
| Non-Hodgkin’s lymphoma |
| Metastatic Kaposi's sarcoma |