Collision Tumour

(1) A generic term for the extremely rare merging of 2 originally separate—primary—tumours from 2 organs, most often seen at the oesophagogastric junction, where a squamous cell carinoma of oesophageal origin collides with a gastric adenocarcinoma; diagnosis of a collision tumour requires that the 2 tumours be histologically distinct
(2) A neuroendocrine (carcinoid) tumour characterised by discrete populations of neoplastic neuroendocrine cells and glands
References in periodicals archive ?
A rare case of collision tumour was reported in our study, which showed two components of serous cystadenoma and mature cystic teratoma.
Pathologist must be vigilant to look out for rare lesions like actinomycosis and collision tumours.
The differential diagnoses include collision tumour of meningioma and plasmacytoma, inflammatory pseudotumour, idiopathic hypertrophic pachymeningitis (IHP), and intracranial plasma cell granuloma.
Collision tumour of trichofolliculoma and basal cell carcinoma.
M Rossi et al in 2005 reported that both RET and BRAF genes had a role in the genesis of MTCPTC collision tumour.

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