Key result
Complete surgical resection adequately treats ovarian Masson tumors in two reported cases.
Why the study?
Extravascular papillary endothelial hyperplasia (Masson tumor) rarely occurs, and its manifestation within the ovary had not previously been described.
Case Report (n=2)
This report describes the first two cases of extravascular Masson tumor in the ovary, highlighting that it can mimic malignancy radiologically but has a good prognosis after surgical resection.
Ovarian Masson tumor may mimic malignancy on imaging; extends rare extravascular sites but remains hypothesis-generating.
Papillary endothelial hyperplasia or Masson tumor most commonly occurs within the extremities and head and neck. It is usually of intravascular type, associated with thrombus formation and organization within a preexisting vessel or vascular malformation, but rarely can be extravascular. We describe the first 2 cases of this extravascular type to occur within the ovary, one of which mimicked malignancy radiologically. This condition is thought to represent a reactive phenomenon with reparative response secondary to thrombosis although with an unclear underlying pathogenesis. The prognosis is generally good, with complete surgical resection usually representing adequate treatment.
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Sherring et al. (2020) conducted a case report in Ovarian Extravascular Papillary Endothelial Hyperplasia (Masson Tumor) (n=2). Surgical resection was evaluated. Two cases of extravascular papillary endothelial hyperplasia (Masson tumor) occurring within the ovary are described, with complete surgical resection representing adequate treatment.
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