**Core Concept**
The management of a woman with a negative Pap smear but a positive endocervical curettage (ECC) involves addressing the discrepancy between the two tests. ECC is a more sensitive test for detecting high-grade cervical lesions, particularly adenocarcinoma in situ (AIS) and adenocarcinoma. The presence of a positive ECC in the face of a negative Pap smear necessitates further evaluation to rule out underlying cervical pathology.

**Why the Correct Answer is Right**
The next step in management is to perform a colposcopy, which is a diagnostic procedure that uses a colposcope to examine the cervix, vagina, and vulva for signs of disease. A colposcopy allows for a more detailed examination of the cervical transformation zone, where most cervical lesions occur. This is particularly important in the case of a positive ECC, as it may indicate the presence of a high-grade lesion that is not visible on a routine Pap smear. The colposcopy may also guide the performance of a biopsy, which is essential for definitive diagnosis and treatment planning.

**Why Each Wrong Option is Incorrect**
**Option A:** Routine follow-up Pap smear in 1 year is incorrect because it may miss a high-grade lesion that requires immediate attention.
**Option B:** Human Papillomavirus (HPV) testing is not the next step in management, as it is used as an adjunct to Pap smear screening rather than a diagnostic tool in this scenario.
**Option C:** Cone biopsy is not the next step in management, as it is a more invasive procedure typically reserved for cases where a high-grade lesion is suspected but not confirmed by colposcopy and biopsy.

**Clinical Pearl / High-Yield Fact**
In cases of a positive ECC with a negative Pap smear, it is essential to perform a colposcopy to evaluate the cervix for high-grade lesions, particularly adenocarcinoma in situ (AIS) and adenocarcinoma.

**Correct Answer: C. Colposcopy.**