J Menopausal Med.  2016 Aug;22(2):114-117. 10.6118/jmm.2016.22.2.114.

Torsion of Collision Tumor: Dermoid Cyst and Fibrothecoma with Postmenopausal Bleeding

• Kim JH

• KMID: 2365467
• DOI: http://doi.org/10.6118/jmm.2016.22.2.114

Abstract

The term collision tumor refers to the coexistence of two adjacent but histological distinct tumors with no histological admixture at the interface. Collision tumors involving ovaries are extremely rare. A collision tumor composed of a dermoid cyst and fibrothecoma is extremely rare in menopausal women. The mechanism of the development of collision tumor is uncertain. During clinical evaluation, differentiation of characters of these ovarian tumors is important to decide appropriate treatment strategies and for good prognosis. We report an unusual clinical manifestation of the torsion of a dermoid cyst and fibrothecoma in the right ovary with postmenopausal bleeding.

Keyword

Collision tumor; Dermoid cyst; Fibrothecoma; Postmenopause; Torsion

MeSH Terms

Dermoid Cyst*
Female
Hemorrhage*
Humans
Ovary
Postmenopause
Prognosis

Figure

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  Fig. 1 (A) T1-weighted magnetic resonance (MR) image shows a multiloculated cystic mass with heterogenous low signal intensity in the right pelvic cavity. (B) T2-weighted MR image shows heterogenous high signal intensity of the mass.

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  Fig. 2 Microscopic features of collision tumor. (A) Microscopic features of solid component of ovarian fibrothecoma composed of fascicles of spindle cells with centrally placed nuclei and a moderate amount of pale cytoplasm without atypia or myxoid change (H & E, original magnification ×100). (B) Microscopic features of cystic component of ovarian mature cystic teratoma composed of skin adnexa and cystic cavity lined by squamous epithelium (H & E, original magnification ×100).

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