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Updated: Jun 11, 2026

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A 3D Organotypic Melanoma Spheroid Skin Model
Published on: May 18, 2018
Malignant gastrointestinal melanoma with an unknown primary
M V T Krishna Mohan1, Senthil J Rajappa, T Vamshidhar Reddy
1Department of Medical Oncology, Nizam's Institute of Medical Sciences, Punjagutta, Hyderabad, AP, India.
Summary
A rare case of malignant melanoma in India presented as metastatic disease in the stomach and liver, with an unknown primary and no lymph node involvement. This extremely uncommon presentation highlights diagnostic challenges in gastrointestinal melanoma.
Area of Science:
- Oncology
- Gastroenterology
- Pathology
Background:
- Malignant melanoma is a rare cancer in India.
- Metastatic melanoma with an unknown primary is uncommon.
- Gastrointestinal involvement without lymph node metastasis is extremely rare.
Observation:
- A 28-year-old male presented with metastatic malignant melanoma.
- The metastases were located in the stomach and liver.
- The primary tumor site remained unknown.
Findings:
- The case represents an extremely rare instance of malignant melanoma metastasis.
- Gastrointestinal tract involvement occurred without lymph node metastasis.
- The unknown primary adds complexity to the diagnosis and treatment.
Implications:
- This case underscores the importance of considering rare presentations of melanoma.
- It highlights challenges in diagnosing and managing metastatic melanoma of unknown primary.
- Further research into gastrointestinal melanoma is warranted.

