216 HJ Choi, et al. • Submandibular mucocele in a 16-month-old child An intraoral examination revealed an absence of swelling on the floor revealed a non-epithelial lined cyst filled with mucus and mucus- of the mouth. Complete blood count, liver function test, C-reactive containing macrophages in the submandibular gland. There was no protein, tuberculosis skin test, and chest X-ray were unremarkable. complication in the 2-month postoperative period. Ultrasound revealed a well-circumscribed hypoechoic cystic mass Two months later, the patient presented with swelling in the measuring 2×2 cm in the anterior aspect of the left submandibular right submandibular region. CT revealed a well-circumscribed low gland. A computed tomography (CT) scan with intravenous con- attenuation mass measuring 2×2×2.5 cm in the right submandibular trast revealed a well-circumscribed cystic mass measuring 2×2×2.5 space without evidence of the "tail" sign. A post-contrast magnetic cm in the left anterior submandibular gland without a "tail" sign. resonance imaging (MRI) examination revealed an approximately The mass contained no calcifications. Fine needle aspiration 2×2×2.5 cm sized, well-defined cystic mass containing a thick rim- cytology was undertaken and revealed that the aspirated material enhancing smaller mass medially in the right submandibular space was composed of mucus with some inflammatory cells. Surgical without evidence of the "tail" sign (Fig. 1). During surgery, the exploration revealed a cystic mass, which was dissected with the left cyst was observed to be closely related to the submandibullar and submandibular and sublingual glands. A pathological examination sublingual glands, and also tightly adherent to the mandible bone. (B) SM C SM C (A) C SM C SM Fig. 1. Axial magnetic resonance images through the submandibular region (postcontrast MRI). A well-defined cystic mass, about 2×2×2.5 cm in size, with thick rim-enhancing one medially in right submandibular space (C). It is in close proximity to the right submandibular gland (SM), without evidence of a "tail" sign. (A) T1-weighted (low signal intensity), (B) T2-weighted (high signal intensity). C, cyst. (A) (B) Fig. 2. (A) Operative resection of the mass. The relationship between the cyst and submandibular is seen. (B) Gross examination of the excised specimen. C, cyst; SM, submandibular gland.