WordNet

not dangerous to health; not recurrent or progressive (especially of a tumor)
pleasant and beneficial in nature or influence; "a benign smile"; "the benign sky"; "the benign influence of pure air" (同)benignant
kindness of disposition or manner; "the benign ruler of millions"; "benign intentions"
of or relating to or resembling a cyst
of or relating to a normal cyst (as the gallbladder or urinary bladder)
a closed sac that develops abnormally in some body structure
a tumor consisting of a mixture of tissues not normally found at that site

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Hills SE1, Maddalozzo J2.
Otolaryngologic clinics of North America.Otolaryngol Clin North Am.2015 Feb;48(1):209-223. doi: 10.1016/j.otc.2014.09.014.
Defects of embryologic development give rise to a variety of congenital lesions arising from the epithelium and are among the most common congenital lesions of the head and neck in the pediatric population. This article presents several congenital lesions of epithelial origin, including congenital m
PMID 25439555

Pure primary ovarian squamous cell carcinoma: A case report and review of the literature.

Park JW, Bae JW.
Oncology letters.Oncol Lett.2015 Jan;9(1):321-323. Epub 2014 Oct 31.
Pure primary ovarian squamous cell carcinoma (SCC) is a rare lesion that usually arises from the malignant transformation of an existing ovarian dermoid cyst. The de novo occurrence of an ovarian SCC in the absence of a prior ovarian dermoid cyst, Brenner tumor or endometriosis is extremely rare. At
PMID 25435984

Decidualisation of ovarian endometriomas in pregnancy: a management dilemma. A case report and review of the literature.

Taylor LH1, Madhuri TK, Walker W, Morton K, Tailor A, Butler-Manuel S.
Archives of gynecology and obstetrics.Arch Gynecol Obstet.2014 Dec 2. [Epub ahead of print]
INTRODUCTION: Increased progesterone levels during pregnancy may cause decidualisation of endometriomas mimicking malignancies on radiology and causing management dilemmas.CASE: An ovarian cyst was detected in a 33-year-old woman at her routine 12-week gestation ultrasound scan. By 18 weeks, the un
PMID 25451061