A curious serendipitous finding: Spitz naevus combined with a syringoma

ROS1 Fusion Angiomatoid Spitz Nevus With Eccrine Duct Fibroadenomatosis and Syringoid Features

ABSTRACT

Eccrine duct fibroadenomatosis is a reactive histological phenomenon observed in a variety of inflammatory and neoplastic pathologies. We report a case of a ROS1 fusion angiomatoid Spitz nevus with associated acrosyringeal hyperplasia and a syringoma-like ductal proliferation in a young female patient.

Melanoma in situ and syringoma: a rare collision tumor. Clinical-pathological report of a case

Collision or contiguous tumors, defined as two or more distinct tumors occurring at one site, are often an unexpected finding and may represent a diagnostic challenge, as clinical and histological presentations do not always coincide. Various combinations of collision tumors have been described with respect to melanocytic lesions, with the most frequently reported being the combination of nevus and basal cell carcinoma. We present an unusual case on the nose involving a melanoma in situ and a clinically-inapparent syringoma, which, to the best of our knowledge, is the first report of this combination.

Collision skin lesions-results of a multicenter study of the International Dermoscopy Society (IDS)

Background

Collision lesions as two independent and unrelated skin tumors often manifest an atypical morphology.

Objective

To determine the combinations of collision skin lesions (CSLs).

Methods

Twenty-one pigmented lesion clinics in nine countries included 77 histopathologically proven CSLs in this retrospective observational study.

Results

Seventy-seven CSLs from 75 patients (median age 59.8 years) were analyzed; 24.7% of CSLs were located on the head and neck area, 5.2% on the upper extremities, 48.1% on the trunk, and 11.7% on the lower extremities; 40.3% revealed a melanocytic component (median age 54.7 years), followed by 45.5% with a basal cell carcinoma (BCC) (median age 62.4 years) and 11.7% with a seborrheic keratosis (median age 64.7 years). CSLs with a BCC component were more often found on the head and neck area compared to tumors with a melanocytic component (34.3% versus 16.1%). Lesions with a melanocytic component were more often detected on the trunk compared to lesions with a BCC (64.5% versus 37.1%). Patients with CSLs with epidermal-epidermal cell combination were older than patients with epidermal-dermal cell combination (63 versus 55.2 years), were more often male than female (63% versus 43.3%), more often had the lesion on the head and neck area (32.6% versus 13.3%), and less often on the upper (2.2 % versus 10%) or lower extremities (8.7% versus 16.6%).

Conclusions

CSLs consist of a heterogeneous group of lesions of varying cell types. They are associated with advancing age and cumulative UV-exposure. CSLs manifest a complex morphology making it challenging to diagnose correctly.