Fibroblastic and myofibroblastic tumors constitute an important group of neoplasms in children and adolescents. These span the full spectrum of clinical behavior, ranging from benign to intermediate and malignant. We report a case of a benign mesenchymal tumor with myofibroblastic differentiation in a 9-year-old girl arising in the left groin that met the histologic features described for myofibroblastoma in adults. Two types are recognized in adults: angiomyofibroblastoma and mammary-type myofibroblastoma of soft tissue. Our case shared features of both these subtypes but was not typical of either one, and we therefore designated our case simply as "myofibroblastoma." Our case showed expression of estrogen receptor protein, which is characteristic of adult lesions, but not a deletion of 13q14, as has been reported in some adult cases. In the English-language literature, only 6 cases have been reported in patients under 21 years of age, and all but 1 were teenagers. Pediatric surgeons, oncologists, and pathologists should be aware that such a benign entity can occur in this patient population and could be confused with other lesions, including malignant ones.

Malignant nodular hidradenoma (MNH) is a rare invasive tumour arising from eccrine sweat glands, with significant risk for local recurrence and distant metastases. Hidradenoma papilliferum is reported in pregnancy. To our knowledge this is the first MNH in a human immunodeficiency virus (HIV) infected pregnant woman. The patient presented with a painless perianal growth. Wide local excision was performed and the wound left to heal by secondary intension. The pathology report confirmed MNH. The patient has been followed for 14 months without evidence of recurrence. MNH should be considered in the differential diagnosis of similar lesions in HIV infected patients. Treatment for such HIV infected patients with MNH may be similar to that in immune-competent patients; they may benefit from a longer follow-up period.