
Nodular melanoma (NM) is the most aggressive form of melanoma. It tends to grow more rapidly in thickness (penetrate the skin) than in diameter. Instead of arising from a pre-existing mole, it may appear in a spot where a lesion did not previously exist . Since NM tends to grow in depth more quickly than it does in width, and can occur in a place ...
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http://en.wikipedia.org/wiki/Nodular_melanoma

A very aggressive form of melanoma that tends to grow “down” into deeper skin tissue rather than along the surface of the skin. It accounts for approximately 15% of diagnosed melanomas.
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http://southbayskindoctor.com/glossary-of-dermatology-terms/

<tumour> Primary cutaneous melanoma characterised by dermal invasion extending to the lateral margins of epidermal involvement or ulceration. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

a type of malignant melanoma without a perceptible radial growth phase, usually seen on the head, neck, or trunk as a uniformly pigmented, elevated, discolored, rapidly enlarging nodule that ulcerates.
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http://www.encyclo.co.uk/local/21001

Type: Term Definitions: 1. primary cutaneous melanoma that presents as rapidly growing smoothly spheroid or ulcerated nodules in which tumor cells microscopically invade the dermis beneath all the lateral epidermal margins of involvement.
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http://www.medilexicon.com/medicaldictionary.php?t=53717

Nodular melanoma: See: Melanoma, nodular.
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http://www.medterms.com/script/main/art.asp?articlekey=23656

A type of malignant melanoma, found most commonly in the skin of the chest or back. Can develop quite quickly and is most common in middle aged people.
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https://www.encyclo.co.uk/local/20753
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