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  • Title: Clinicopathological analysis of 384 cases of poroid neoplasms including 98 cases of apocrine type cases.
    Author: Ito K, Ansai SI, Fukumoto T, Anan T, Kimura T.
    Journal: J Dermatol; 2017 Mar; 44(3):327-334. PubMed ID: 27177596.
    Abstract:
    We examined 384 cases of poroid neoplasms. Most cases (n = 279, 72.7%) exhibited the features of only one subtype. One hundred and ninety-eight cases (51.6%) showed only the features of poroma (P), 20 (5.2%) hidroacanthoma simplex (HS), five (1.3%) dermal duct tumor (D) and 56 (14.6%) hidradenoma (HA). Composite tumors of those four subtypes were observed in 105 cases (27.3%). In the trunk and lower extremities, lesions with the features of P were observed at higher rates than other sites. Those of HS and D were more frequently observed in the lower extremities. Those of HA were seen at higher rates in the scalp, face, neck and genitalia. Ninety-eight cases (25.5%) showed decapitation secretion and diagnosed as apocrine type lesion. Apocrine type lesions were frequently observed in the lesions on the genitalia (40.0%), scalp (31.8%) and trunk (31.1%), whereas at lower rates in those on the neck (21.4%) and lower extremities (24.0%). In apocrine type cases, the lesions were located more frequently on the scalp and trunk than non-apocrine type, whereas were less frequent on extremities. The rate of apocrine type lesions in the cases with only one subtype (19.7%) was lower than that of those with composite tumors (41.0%). In the apocrine type (43.9%), composite tumors are more frequent than in the non-apocrine type (21.7%). In D (40.8%) and HA (32.3%), apocrine type lesions were more frequently observed than other subtypes. In conclusion, it should be noted that a quarter of poroid neoplasms are composite tumors and/or show apocrine differentiation.
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