"畸形地伸长的" can be translated into English as "abnormally elongated" or "deformedly elongated", depending on the context and the desired nuance.
"Abnormally elongated" is more commonly used and implies that the elongation is unusual or not in line with normal growth or development.
"Deformedly elongated" emphasizes the distortion or abnormality in the shape resulting from the elongation, suggesting a more pronounced or visible deformity.
In most cases, "abnormally elongated" would be a suitable and natural choice.