Ovarian metastasis refers to spread of a primary malignancy from another organ to the ovaries. Most commonly from the gastrointestinal tract (especially stomach — Krukenberg tumor), breast, colon, and lung. Krukenberg tumor classically describes bilateral, solid/solid-cystic ovarian masses with signet ring cell metastasis from gastric adenocarcinoma. Spread occurs via hematogenous, lymphatic, or transperitoneal routes. Ovarian metastases account for 5-30% of all ovarian malignancies and often indicate advanced-stage disease.
Age Range
40-70
Peak Age
55
Gender
Female predominant
Prevalence
Uncommon
Ovarian metastases develop through three pathways: (1) Hematogenous spread — particularly from gastric, breast, and lung primaries lodging in ovarian vasculature; (2) Transperitoneal implantation — free tumor cells in peritoneal fluid seeding the ovarian surface (from colon, ovary, and appendix); (3) Lymphatic spread — via retroperitoneal lymph node drainage to ovaries. In Krukenberg tumors, gastric signet ring cells incite a dense fibroblastic stromal reaction creating a solid mass — this desmoplastic stroma appears as hypointense/hypodense solid component on imaging. Bilateral involvement supports hematogenous/lymphatic dissemination. Areas of cystic degeneration reflect zones of mucinous necrosis and create heterogeneous appearance on CT/MRI.
Bilateral, predominantly solid, heterogeneously enhancing ovarian masses are the signature finding of metastatic disease. Krukenberg tumor from GI tract classically presents as bilateral, round/oval, smooth-contoured but internally heterogeneous solid-cystic masses. Bilaterality is seen in 60-80% and is the most important clue for distinguishing from primary ovarian tumors (usually unilateral).
Bilateral solid or mixed solid-cystic ovarian masses. Solid component is predominant with irregular internal echoes and heterogeneous architecture. Cystic areas reflect necrosis or mucinous content.
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Heterogeneous solid-cystic masses are seen in both ovaries, and bilateral involvement suggests metastatic disease.
Increased internal vascularity in solid component. Irregular vascular distribution and low resistance index (RI <0.5) support malignancy.
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Doppler examination demonstrates increased internal vascularity and low resistance index in the solid components of the masses.
Bilateral enhancing solid masses in both ovaries on portal venous phase. Heterogeneous enhancement pattern — solid areas enhance moderately to avidly while necrotic/cystic areas do not enhance. Krukenberg tumors may have smooth outer contour but heterogeneous internal architecture.
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Heterogeneously enhancing solid-cystic masses are seen in both ovaries on portal venous phase, and bilateral involvement suggests metastatic disease.
Accompanying peritoneal implants (omental cake, nodular peritoneal thickening) and ascites. Peritoneal carcinomatosis findings indicate advanced metastatic disease.
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Peritoneal implants and ascites accompanying the ovarian masses are seen, consistent with peritoneal carcinomatosis.
Solid component demonstrates intermediate-to-low signal intensity on T2-weighted images (desmoplastic fibrous stroma). Cystic/necrotic areas show high T2 signal. This mixed pattern is characteristic for Krukenberg tumor.
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Low signal in solid component and high signal in cystic areas are seen on T2-weighted sequences, demonstrating a mixed pattern consistent with Krukenberg tumor.
Marked diffusion restriction in solid component on DWI (bright signal on high b-value, low signal on ADC map). Reflects high cellularity and increased nuclear-to-cytoplasmic ratio.
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Marked diffusion restriction is seen in the solid components of the masses on DWI, assessed as malignant character suggesting high cellularity.
Solid component isointense to muscle on T1-weighted images. Hemorrhagic areas may show high T1 signal. Mucinous Krukenberg tumors may demonstrate mild T1 hyperintensity due to mucin content.
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The solid component is isointense to muscle on T1-weighted sequences with focal hyperintense areas consistent with hemorrhagic or mucinous content.
Criteria
Ovarian metastasis from gastric adenocarcinoma. Signet ring cell histology. Bilateral involvement 80%+. Desmoplastic stromal reaction.
Distinct Features
Usually solid-predominant, smooth-contoured, low T2 signal solid component due to dense fibrous stroma. Mucinous areas may be mildly hyperintense on T1.
Criteria
Ovarian metastasis from colorectal carcinoma. Transperitoneal spread predominant. Cystic component may be more prominent.
Distinct Features
More prominent cystic component (necrotic), irregular wall and septal thickening. Accompanying peritoneal implants common. Elevated CEA. May be unilateral (40%).
Criteria
Hematogenous spread from breast carcinoma. More common in lobular type breast carcinoma. Usually small, solid masses.
Distinct Features
Usually small (<5 cm), solid, homogeneously enhancing masses. May be bilateral. Cystic degeneration rare. CA-125 elevation may be confused with primary ovarian cancer.
Criteria
Ovarian metastasis from appendiceal mucinous neoplasm. Pseudomyxoma peritonei — accumulation of gelatin-like mucinous material in peritoneal cavity.
Distinct Features
Low-density mucinous ascites, scalloping of organ surfaces, peritoneal mucinous implants. Ovarian masses may have mucinous cystic architecture.
Distinguishing Feature
Primary serous carcinoma is usually unilateral (60-70%), larger, with prominent papillary projections and predominant cystic component. Even with peritoneal involvement, ovarian origin is considered. Metastasis is bilateral (60-80%), solid-predominant, and known primary malignancy history is the critical distinguishing factor.
Distinguishing Feature
Primary mucinous carcinoma is usually unilateral (95%+), very large (>10 cm), multilocular cystic with 'stained glass' pattern (loculations of different signal intensity). Krukenberg mucinous metastasis is bilateral and more solid-predominant. Bilateral mucinous ovarian mass → primary GI malignancy should be investigated.
Distinguishing Feature
Dysgerminoma occurs in young age group (10-30 years), solid homogeneous mass, lobulated contour, solid structure divided by septa ('spoked wheel'). Bilateral 10-20%. Elevated LDH. Metastasis is distinguished by middle-advanced age, known primary malignancy history, and CA-125/CEA elevation.
Distinguishing Feature
Granulosa cell tumor is usually unilateral, solid-cystic (sponge pattern), heterogeneous on T2. May be accompanied by endometrial thickening due to estrogen production. Metastasis is bilateral, known primary malignancy history, no estrogen production.
Urgency
urgentManagement
medicalBiopsy
NeededFollow-up
specialist-referralOvarian metastasis indicates advanced-stage disease and requires multidisciplinary approach. Primary malignancy must be identified — upper/lower GI endoscopy, breast imaging, chest CT. Histological confirmation through biopsy/surgery is important — signet ring cells confirm Krukenberg diagnosis. Treatment targets the primary tumor, usually systemic chemotherapy. Bilateral ovarian involvement requires different surgical approach than ovarian cancer alone — debulking surgery must be coordinated with primary tumor treatment. Prognosis depends on primary tumor type; gastric origin has worst prognosis.
Ovarian metastasis is associated with poor prognosis as it indicates disseminated disease. Metastasis should be the primary consideration when bilateral ovarian masses are detected in patients with known malignancy. Krukenberg tumor (gastric origin) contains mucinous signet ring cells.