Traumatic mucus cyst K13.4

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 03.07.2022

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Extravasation mucocele; Granuloma of the oral mucosa; Mucocele; mucoid cyst; Mucosal salivary granuloma; Mucous cyst of oral mucosa; Mucous membrane granuloma; Mucus cyst traumatic; Mucus retention cyst traumatic; oral mucocele; Traumatic cyst of the mucous gland; Traumatic mucus retention cyst

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After rupture of a salivary gland duct, usually solitary, only in exceptional cases multiple, glassy, soft, mostly painless pseudocyst with subsequent formation of a foreign body granuloma.

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Mostly injury of a salivary gland in case of bite injury or other trauma of the oral mucosa. This results in the formation of an extravasation mucocele with a pseudocystic granulomatous reaction to the mucus extravasated into the tissue (extravasation type).

Less common are mucus retentions due to obstruction of the glandular excretory duct (retention type).

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In clinical studies the age of manifestation is given as between 15-40 years. There are no gender differences.

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Mainly lip mucosa (mostly lower lip about 35%), also cheek mucosa or ventral edge of the tongue (about 25%) are affected.

Clinical features
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Quite predominantly sudden, single, rarely multiple, reddish-bluish, glassy, soft, hemispherical, about 0.5-1.5 cm in size, protuberant, glassy pale, but also bluish in appearance, usually painless nodule covered by a normal mucosa.

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Cyst (pseudocyst) filled with mucoid substance, surrounded by a connective tissue pseudocapsule with peripheral formation of a foreign body granuloma with mucin-storing PAS-positive macrophages. Superficial subepithelial extravasation may lead to the imitation of a blistering disease.

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Excision if necessary.

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Mucus granulomas generally regress after a few weeks. Exceptionally, they can also transform into permanent, firm, mostly pedunculated nodules (papillomas - see papilloma below), which can be disturbing during chewing.

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Mucous cysts of the floor of the mouth are called ranula. This is a retention mucocele of the sublingual gland.

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Please ask your physician for a reliable diagnosis. This website is only meant as a reference.


Last updated on: 03.07.2022