Sister Mary Joseph Nodule as a Cutaneous Manifestation of Metastatic Appendiceal Adenocarcinoma: Case Report and Literature Review

Sister Mary Joseph's Nodule: Where Umbilicus Holds the Truth!

An umbilical metastasis from an internal visceral malignancy is defined as Sister Mary Joseph's nodule (SMJN), and, although a rare finding, it is a very poor prognostic indicator. We describe an interesting case of metastatic colon cancer with SMJN, emphasizing the significance of this classic finding. A 64-year-old female with a history of stage IV colon cancer with palliative right hemicolectomy and left hepatectomy presented to the hospital with nausea and abdominal discomfort. A computed tomography (CT) scan of the abdomen was performed, which showed small bowel obstruction secondary to metastatic tumor mass compressing the duodenum. She refused to undergo any chemotherapy or endoscopic intervention and was eventually discharged on hospice care. During the hospital stay an umbilical ulcerative lesion was also noted, which was violaceous, measuring 4.5 x 4 cm in size, firm in consistency with irregular borders, and tender to touch. Therefore, further history was obtained from the patient about it. Several months ago, she had developed localized swelling around the umbilicus, which gradually enlarged and ulcerated later. She eventually underwent the biopsy of that umbilical lesion, which confirmed it as SMJN with metastasis from the colonic primary. However, the patient refrained from the surgical intervention of the umbilical lesion. SMJN presents as a palpable periumbilical metastatic mass with diameter usually not exceeding 5 cm in size. It can be variable in color from violaceous to reddish brown. Once discovered, such lesions should be worked up with biopsy and imaging studies such as CT scan of the abdomen, as the nodule may be indicative of underlying malignancy or cancer recurrence. Its presence indicates a poor prognosis, with average survival time after diagnosis of SMJN of 10 months.

Cutaneous Metastasis after Surgery, Injury, Lymphadenopathy, and Peritonitis: Possible Mechanisms

Cutaneous metastases from internal malignancies are uncommon. Umbilical metastasis, also known as Sister Joseph nodule (SJN), develops in patients with carcinomatous peritonitis or superficial lymphadenopathy, while non-SJN skin metastases develop after surgery, injury, and lymphadenopathy. In this review, the possible mechanisms of skin metastases are discussed. SJNs develop by the contiguous or lymphatic spread of tumor cells. After surgery and injury, tumor cells spread by direct implantation or hematogenous metastasis, and after lymphadenopathy, they spread by extranodal extension. The inflammatory response occurring during wound healing is exploited by tumor cells and facilitates tumor growth. Macrophages are crucial drivers of tumor-promoting inflammation, which is a source of survival, growth and angiogenic factors. Angiogenesis is promoted by the vascular endothelial growth factor (VEGF), which also mediates tumor-associated immunodeficiency. In the subcutaneous tissues that surround metastatic lymph nodes, adipocytes promote tumor growth. In the elderly, age-associated immunosuppression may facilitate hematogenous metastasis. Anti-VEGF therapy affects recurrence patterns but at the same time, may increase the risk of skin metastases. Immune suppression associated with inflammation may play a key role in skin metastasis development. Thus, immune therapies, including immune checkpoint inhibitors reactivating cytotoxic T-cell function and inhibiting tumor-associated macrophage function, appear promising.