Plunging ranula consists of extravasation of mucin through the mylohyodeum musculature, causing floating cervical volume. Ultrasound is an excellent imaging modality to evaluate obstructive salivary gland diseases. Our study describes a case of an 11-year-old boy presenting a floating cervical volume on the right side, with displacement of the tongue. Ultrasonography showed changes in the mylohyoid muscle, underlying a hypoechoic image in the submandibular region, suggestive of muscle dissection and fluid accumulation, as seen in plunging ranula. Moreover, between submandibular and parotid regions, two rounded hyperechoic images with acoustic shadows, suggestive of giant sialoliths, were observed. The panoramic radiography confirmed two rough radiopaque images of approximately 30 mm, in the posterior region, consistent with giant sialoliths. The cervical swelling was excised, associated with removing the submandibular gland with one of the sialoliths. The histopathological diagnosis confirmed ranula and the patient has undergone 2 months of follow-up with no recurrence. Plunging ranula consists of extravasation of mucin through the mylohyodeum musculature, causing floating cervical volume. Ultrasound is an excellent imaging modality to evaluate obstructive salivary gland diseases. Our study describes a case of an 11-year-old boy presenting a floating cervical volume on the right side, with displacement of the tongue. Ultrasonography showed changes in the mylohyoid muscle, underlying a hypoechoic image in the submandibular region, suggestive of muscle dissection and fluid accumulation, as seen in plunging ranula. Moreover, between submandibular and parotid regions, two rounded hyperechoic images with acoustic shadows, suggestive of giant sialoliths, were observed. The panoramic radiography confirmed two rough radiopaque images of approximately 30 mm, in the posterior region, consistent with giant sialoliths. The cervical swelling was excised, associated with removing the submandibular gland with one of the sialoliths. The histopathological diagnosis confirmed ranula and the patient has undergone 2 months of follow-up with no recurrence.
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