Aims: To elucidate diagnostic criteria for spiradenocarcinoma, cylindrocarcinoma and spiradenocylindrocarcinoma, and to emphasize correlations between clinical behaviour and variable morphological patterns.
Methods And Results: We investigated the clinicopathological and immunophenotypic features of nine cases. There were five men and four women, with ages ranging from 58 years to 82 years. The tumour size varied from 10 mm to 50 mm. The head and neck were most commonly involved. Three cases of spiradenocarcinoma and three cases of cylindrocarcinoma showed a salivary gland-type basal cell adenocarcinoma-like pattern, low-grade (BCAC-LG) and/or high grade (BCAC-HG). The remaining three cases of spiradenocarcinoma showed adenocarcinoma in situ, with invasive adenocarcinoma being seen in one of these cases. PAS staining revealed loss of the PAS-positive hyaline sheath in malignant zones of cylindrocarcinoma. p53 staining was variably positive in the malignant components of all cases. Follow-up was available for all patients, ranging from 5 months to 107 months. Two patients died of disease, one experienced recurrence, and one died of an unrelated cause.
Conclusions: Patients with BCAC-LG have a better prognosis. BCAC-HG is more likely to be found in cylindrocarcinoma, and its clinical behaviour seems to be more aggressive. Close follow-up for early detection of recurrence and metastases is strongly recommended.
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